feat(mgc-dashboard): -1 OFF sentinel on per-pump % control chart

fn_chart_pump_a/b/c now emit -1 on the ctrl output when the cached pump
state is off/idle/maintenance, instead of the residual ctrl% (which would
sit at 0 and be indistinguishable from a pump genuinely running at 0%).
ui_chart_pumps_ctrl ymin set to -5 so the OFF rail is visible below the
0-100 band.

Adds test/integration/per-pump-ctrl-fanout.integration.test.js covering
both chart outputs of all three pumps in populated (running), OFF
(off/idle/maintenance), and degraded (missing state/ctrl/flow, pre-tick,
NaN, ctrl-only delta) states per .claude/rules/output-coverage.md. Updates
test/_output-manifest.md to document the previously-undocumented per-pump
fan-out functions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,16 @@
+# Repo dev artifacts. Mirrors the deny list in .npmignore so the two stay
+# in sync — anything that shouldn't be committed AND shouldn't ship in the
+# npm tarball goes in both files.
+node_modules/
+package-lock.json
+*.tgz
+.env
+.env.*
+.DS_Store
+npm-debug.log*
+
+# Large local artifacts that don't belong in Git.
+# wiki/test.gif: screen recordings of the dashboard are kept locally for
+# reference but exceed 100 MB — use Git LFS or external storage if they
+# need to be shared.
+wiki/test.gif

.npmignore

@@ -0,0 +1,28 @@
+# === Mirrors .gitignore — items below this block are also excluded from
+#     the npm tarball. Kept here verbatim so npm pack doesn't fall back to
+#     the .gitignore inheritance (silent + surprising). ===
+node_modules/
+package-lock.json
+*.tgz
+.env
+.env.*
+.DS_Store
+npm-debug.log*
+
+# Large local screen recording (>100 MB) — kept out of both repo and pack.
+wiki/test.gif
+
+# === Dev-only content the npm tarball doesn't need ===
+# Tests + their harness — Node-RED loads the entry .js, not the test tree.
+test/
+*.test.js
+
+# Wiki / docs — useful in the repo, big in the pack.
+wiki/
+
+# Project memory + IDE configs.
+.claude/
+.codex/
+.repo-mem/
+CLAUDE.md
+CLAUDE.local.md

CLAUDE.md

@@ -21,3 +21,28 @@ Key points for this node:
 - Stack same-level siblings vertically.
 - Parent/children sit on adjacent lanes (children one lane left, parent one lane right).
 - Wrap in a Node-RED group box coloured `#50a8d9` (Unit).
+
+## Folder & File Layout
+
+Every per-node file MUST use the folder name (`machineGroupControl`) **exactly**, case-sensitive. Full rule: [`.claude/rules/node-architecture.md`](https://gitea.wbd-rd.nl/RnD/EVOLV/src/branch/development/.claude/rules/node-architecture.md) in the EVOLV superproject.
+
+| Path | Required name |
+|---|---|
+| Entry file | `machineGroupControl.js` |
+| Editor HTML | `machineGroupControl.html` |
+| Node adapter | `src/nodeClass.js` |
+| Domain logic | `src/specificClass.js` |
+| Editor JS modules | `src/editor/*.js` (extract when inline editor JS exceeds ~50 lines) |
+| Tests | `test/{basic,integration,edge}/*.test.js` |
+| Example flows | `examples/*.flow.json` |
+
+> ⚠️ **Legacy naming drift in this repo** — to be renamed when the file is next touched:
+>
+> | Path | Currently | Should be |
+> |---|---|---|
+> | Entry file | `mgc.js` | `machineGroupControl.js` |
+> | Editor HTML | `mgc.html` | `machineGroupControl.html` |
+>
+> Renames require updating: the file itself, `package.json#node-red.nodes`, any `require()` / `import` paths, and superproject submodule references in one commit.
+
+When adding new files, read the rule above first to avoid drift.

CONTRACT.md

@@ -0,0 +1,70 @@
+# machineGroupControl — Contract
+
+Hand-maintained for Phase 4; the `## Inputs` table is generated from
+`src/commands/index.js` (see Phase 9 generator). Keep ≤ 80 lines.
+
+## Inputs (msg.topic on Port 0)
+
+| Canonical | Aliases (deprecated) | Payload | Effect |
+|---|---|---|---|
+| `set.mode` | `setMode` | `string` — one of `optimalControl`, `priorityControl`, `maintenance` (schema-validated) | Switches the control strategy via `source.setMode(payload)`. |
+| `child.register` | `registerChild` | `string` — the child node's Node-RED id | Resolves the child via `RED.nodes.getNode` and registers it through `childRegistrationUtils.registerChild(childObj.source, msg.positionVsParent)`. |
+| `set.demand` | `Qd` | numeric (number or numeric string) | Calls `source.handleInput('parent', parseFloat(payload))`. On success, replies on Port 0 with `topic = source.config.general.name`, `payload = 'done'`. Non-numeric payloads log `error` and are skipped. |
+
+Aliases log a one-time deprecation warning the first time they fire.
+
+## Outputs (msg.topic on Port 0/1/2)
+
+- **Port 0 (process):** `msg.topic = config.general.name`. Payload built by
+  `outputUtils.formatMsg(..., 'process')` from `getOutput()` — delta-compressed
+  (only changed fields are emitted). On a successful `set.demand` dispatch the
+  node additionally emits `{ topic: <name>, payload: 'done' }` as an
+  acknowledgement.
+- **Port 1 (InfluxDB telemetry):** same shape as Port 0, formatted with the
+  `'influxdb'` formatter.
+- **Port 2 (registration):** at startup the node sends one
+  `{ topic: 'registerChild', payload: <node.id>, positionVsParent }`
+  to the upstream parent.
+
+## Events emitted by `source.measurements.emitter`
+
+The `MeasurementContainer` fires `<type>.<variant>.<position>` whenever
+the corresponding series receives a new value. Parents subscribe via the
+generic `child.measurements.emitter.on(eventName, ...)` handshake.
+machineGroupControl publishes:
+
+- `flow.predicted.atequipment` — aggregated predicted group flow (sum of
+  member-machine predicted flows at the group operating point).
+- `flow.predicted.downstream` — mirror of the live group flow seen at
+  the discharge header (written by `handlePressureChange` for downstream
+  consumers such as pumpingStation).
+- `power.predicted.atequipment` — aggregated predicted group power.
+- `efficiency.predicted.atequipment` — group efficiency = flow/power at
+  the selected operating point.
+- `Ncog.predicted.atequipment` — group normalised cost-of-goods score.
+- `pressure.measured.upstream`, `pressure.measured.downstream`,
+  `pressure.measured.differential` — mirrored from header-side
+  measurement children (`asset.type='pressure'`), when registered.
+
+The exact set is data-driven by which children register and what they
+publish; downstream consumers should subscribe by event name, not assume
+a fixed catalogue.
+
+## Children registered by this node
+
+machineGroupControl accepts two `softwareType`s through the
+`childRegistrationUtils` handshake:
+
+- `machine` — a rotatingMachine. Stored in `source.machines[id]`.
+  The group subscribes to its child's
+  `pressure.measured.differential`, `pressure.measured.downstream`, and
+  `flow.predicted.downstream` events to trigger `handlePressureChange`.
+- `measurement` — a header-side sensor (typically a pressure transmitter
+  at the discharge or suction manifold). The group subscribes to the
+  matching `<asset.type>.measured.<positionVsParent>` event and mirrors
+  the value into its own MeasurementContainer; pressure events also
+  trigger `handlePressureChange` so optimalControl can use ONE header
+  operating point for all pumps.
+
+Position labels accepted from children are `upstream`, `downstream`,
+`atequipment` (and case variants — normalised internally).

examples/01-Basic.json

@@ -0,0 +1,83 @@
+[
+    {
+        "id": "grp_drv_mode",
+        "type": "group",
+        "z": "tab_mgc_basic",
+        "name": "1. Control mode",
+        "style": {
+            "stroke": "#666666",
+            "fill": "#ffdf7f",
+            "fill-opacity": "0.15",
+            "label": true,
+            "color": "#333333"
+        },
+        "nodes": [
+            "inj_mode_optimal",
+            "inj_mode_priority"
+        ],
+        "x": 714,
+        "y": 19,
+        "w": 292,
+        "h": 122
+    },
+    {
+        "id": "inj_mode_optimal",
+        "type": "inject",
+        "z": "tab_mgc_basic",
+        "g": "grp_drv_mode",
+        "name": "set.mode = optimalControl",
+        "props": [
+            {
+                "p": "topic",
+                "vt": "str"
+            },
+            {
+                "p": "payload",
+                "v": "optimalControl",
+                "vt": "str"
+            }
+        ],
+        "repeat": "",
+        "crontab": "",
+        "once": false,
+        "onceDelay": "",
+        "topic": "set.mode",
+        "x": 870,
+        "y": 60,
+        "wires": [
+            [
+                "mgc_basic_node"
+            ]
+        ]
+    },
+    {
+        "id": "inj_mode_priority",
+        "type": "inject",
+        "z": "tab_mgc_basic",
+        "g": "grp_drv_mode",
+        "name": "set.mode = priorityControl",
+        "props": [
+            {
+                "p": "topic",
+                "vt": "str"
+            },
+            {
+                "p": "payload",
+                "v": "priorityControl",
+                "vt": "str"
+            }
+        ],
+        "repeat": "",
+        "crontab": "",
+        "once": false,
+        "onceDelay": "",
+        "topic": "set.mode",
+        "x": 870,
+        "y": 100,
+        "wires": [
+            [
+                "mgc_basic_node"
+            ]
+        ]
+    }
+]

examples/README.md

@@ -1,8 +1,51 @@
-# machineGroupControl Example Flows
+# machineGroupControl - Example Flows
 
-Import-ready Node-RED examples for machineGroupControl.
+Import-ready Node-RED examples for `machineGroupControl` (MGC). MGC is not a standalone node — it needs at least one `rotatingMachine` child to dispatch demand to. Both flows below ship three child pumps.
 
 ## Files
-- basic.flow.json
-- integration.flow.json
-- edge.flow.json
+
+| File | Tier | What it shows |
+|---|---|---|
+| `01-Basic.json` | 1 | One MGC + three `rotatingMachine` pumps driven by inject buttons. Setup once-fires `virtualControl` + `cmd.startup` on all three pumps; mode / scaling / demand are then driven by buttons. |
+| `02-Dashboard.json` | 2 | Same command surface driven by a FlowFuse Dashboard 2.0 page — mode + scaling buttons, demand slider, live status rows, three trend charts, and a raw-output table. |
+
+## Prerequisites
+
+- Node-RED with the EVOLV package installed (`machineGroupControl` and `rotatingMachine` registered).
+- For `02-Dashboard.json`: `@flowfuse/node-red-dashboard` (Dashboard 2.0).
+
+## Load a flow
+
+```bash
+curl -X POST -H 'Content-Type: application/json' \
+  --data @nodes/machineGroupControl/examples/01-Basic.json \
+  http://localhost:1880/flows
+```
+
+Or in the editor: Menu → Import → drag the file → Import.
+
+## Canonical command surface
+
+| Topic | Aliases | Payload | What it does |
+|---|---|---|---|
+| `set.mode` | `setMode` | `"optimalControl"`, `"priorityControl"`, `"prioritypercentagecontrol"`, `"maintenance"` | Switch dispatch strategy |
+| `set.scaling` | `setScaling` | `"normalized"`, `"absolute"` | Interpret demand as 0–100 % vs m³/h |
+| `set.demand` | `Qd` | number | Operator demand setpoint |
+| `child.register` | `registerChild` | child node id (string) | Manually register a child (Port 2 wiring does this automatically) |
+
+## 01-Basic — what to try
+
+1. Deploy. After ~1.5 s the Setup group auto-fires, putting all three pumps in `virtualControl` mode + sending `cmd.startup` to each.
+2. Click `set.demand = 50 %` — MGC's `optimalControl` picks the best pump combination by BEP-gravitation and dispatches `flowmovement` to the selected pumps.
+3. Click `set.demand = 100 %` — MGC switches to a higher combination, possibly engaging an extra pump.
+4. Switch mode to `priorityControl` and try the same demands — pumps now run equal-flow by priority order.
+5. Switch scaling to `absolute` — set.demand is now interpreted as m³/h (capped at the group min / max).
+6. `set.demand = 0` — MGC calls `turnOffAllMachines`, all pumps shut down.
+
+## 02-Dashboard — what to try
+
+1. Deploy → open `http://localhost:1880/dashboard/mgc-basic`.
+2. The dashboard auto-initialises the pumps; the `Initialize pumps` button on the page re-runs the setup manually.
+3. Drag the **Demand** slider — MGC dispatches and the Flow / Power / BEP charts react.
+4. Switch modes and scalings via the buttons; the Mode / Scaling rows in the Status panel reflect the change.
+5. Inspect the **Raw output** table for the full Port 0 surface (every field MGC emits, including `flowCapacityMax`, `machineCountActive`, `absDistFromPeak`, `relDistFromPeak`).

examples/basic.flow.json

@@ -1,6 +0,0 @@
-[
-  {"id":"machineGroupControl_basic_tab","type":"tab","label":"machineGroupControl basic","disabled":false,"info":"machineGroupControl basic example"},
-  {"id":"machineGroupControl_basic_node","type":"machineGroupControl","z":"machineGroupControl_basic_tab","name":"machineGroupControl basic","x":420,"y":180,"wires":[["machineGroupControl_basic_dbg"]]},
-  {"id":"machineGroupControl_basic_inj","type":"inject","z":"machineGroupControl_basic_tab","name":"basic trigger","props":[{"p":"topic","vt":"str"},{"p":"payload","vt":"str"}],"topic":"ping","payload":"1","payloadType":"str","x":160,"y":180,"wires":[["machineGroupControl_basic_node"]]},
-  {"id":"machineGroupControl_basic_dbg","type":"debug","z":"machineGroupControl_basic_tab","name":"machineGroupControl basic debug","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":660,"y":180,"wires":[]}
-]

examples/edge.flow.json

@@ -1,6 +0,0 @@
-[
-  {"id":"machineGroupControl_edge_tab","type":"tab","label":"machineGroupControl edge","disabled":false,"info":"machineGroupControl edge example"},
-  {"id":"machineGroupControl_edge_node","type":"machineGroupControl","z":"machineGroupControl_edge_tab","name":"machineGroupControl edge","x":420,"y":180,"wires":[["machineGroupControl_edge_dbg"]]},
-  {"id":"machineGroupControl_edge_inj","type":"inject","z":"machineGroupControl_edge_tab","name":"unknown topic","props":[{"p":"topic","vt":"str"},{"p":"payload","vt":"str"}],"topic":"doesNotExist","payload":"x","payloadType":"str","x":170,"y":180,"wires":[["machineGroupControl_edge_node"]]},
-  {"id":"machineGroupControl_edge_dbg","type":"debug","z":"machineGroupControl_edge_tab","name":"machineGroupControl edge debug","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":660,"y":180,"wires":[]}
-]

examples/integration.flow.json

@@ -1,6 +0,0 @@
-[
-  {"id":"machineGroupControl_int_tab","type":"tab","label":"machineGroupControl integration","disabled":false,"info":"machineGroupControl integration example"},
-  {"id":"machineGroupControl_int_node","type":"machineGroupControl","z":"machineGroupControl_int_tab","name":"machineGroupControl integration","x":420,"y":180,"wires":[["machineGroupControl_int_dbg"]]},
-  {"id":"machineGroupControl_int_inj","type":"inject","z":"machineGroupControl_int_tab","name":"registerChild","props":[{"p":"topic","vt":"str"},{"p":"payload","vt":"str"}],"topic":"registerChild","payload":"example-child-id","payloadType":"str","x":170,"y":180,"wires":[["machineGroupControl_int_node"]]},
-  {"id":"machineGroupControl_int_dbg","type":"debug","z":"machineGroupControl_int_tab","name":"machineGroupControl integration debug","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":680,"y":180,"wires":[]}
-]

mgc.html

@@ -8,19 +8,69 @@
 | **Control Module**     | `#a9daee`           | zwart      |
 
 -->
-<script src="/machineGroupControl/menu.js"></script> <!-- Load the menu script for dynamic dropdowns --> 
-<script src="/machineGroupControl/configData.js"></script> <!-- Load the config script for node information --> 
+<script src="/machineGroupControl/menu.js"></script> <!-- Load the menu script for dynamic dropdowns -->
+<script src="/machineGroupControl/configData.js"></script> <!-- Load the config script for node information -->
+
+<!-- Editor JS modules — see nodes/machineGroupControl/src/editor/. Loaded in
+     dependency order: index.js (namespace + helpers) → modules → oneditprepare. -->
+<script src="/machineGroupControl/editor/index.js"></script>
+<script src="/machineGroupControl/editor/mode-cards.js"></script>
+<script src="/machineGroupControl/editor/compact-fields.js"></script>
+<script src="/machineGroupControl/editor/oneditprepare.js"></script>
+
+<style>
+  /* MGC-specific UI: strategy mode cards + rendezvous toggle.
+     Generic .evolv-icon-picker / .evolv-icon-option styles for the
+     output-format pickers come from generalFunctions' iconHelpers (auto-
+     injected by /menu.js). */
+  .mgc-mode-cards,
+  .mgc-toggle-row { display:flex; gap:6px; flex-wrap:wrap; margin:6px 0 4px 0; }
+  .mgc-mode-card,
+  .mgc-toggle-card {
+    width:94px; height:86px; box-sizing:border-box;
+    border:2px solid #d0d0d0; border-radius:4px; background:#fafafa;
+    padding:4px; cursor:pointer; user-select:none;
+    display:flex; flex-direction:column; align-items:center; justify-content:center; gap:2px;
+    transition:border-color 80ms ease-out, background 80ms ease-out;
+  }
+  .mgc-mode-card:hover,
+  .mgc-toggle-card:hover { border-color:#86bbdd; background:#f5fafd; }
+  .mgc-mode-card:focus,
+  .mgc-toggle-card:focus { outline:2px solid #1F4E79; outline-offset:2px; }
+  .mgc-mode-card-on,
+  .mgc-toggle-card-on { border-color:#50a8d9; background:#eaf4fb; }
+  .mgc-mode-card-svg,
+  .mgc-toggle-card-svg { width:100%; height:54px; display:flex; align-items:center; justify-content:center; }
+  .mgc-mode-card-svg svg,
+  .mgc-toggle-card-svg svg { width:100%; height:100%; display:block; }
+  .mgc-mode-card-label,
+  .mgc-toggle-card-label { font-size:10px; line-height:1; font-weight:600; color:#333; white-space:nowrap; letter-spacing:0; }
+  .mgc-toggle-card:not(.mgc-toggle-card-on) .mgc-toggle-card-svg { opacity:0.45; filter:grayscale(1); }
+  .mgc-toggle-card:not(.mgc-toggle-card-on) .mgc-toggle-card-label { color:#888; }
+  .mgc-hidden-checkbox { position:absolute; opacity:0; width:1px; height:1px; pointer-events:none; }
+  .mgc-section-divider { border:0; border-top:1px solid #d6d6d6; margin:12px 0; }
+  .mgc-output-row > label { white-space:nowrap; width:130px; }
+</style>
 
 <script>
     RED.nodes.registerType('machineGroupControl',{
     category: "EVOLV",
-    color: "#50a8d9",
+    color: "#B5651D",
     defaults: {
       // Define default properties
       name: { value: "" },
       processOutputFormat: { value: "process" },
       dbaseOutputFormat: { value: "influxdb" },
 
+      // Control strategy
+      mode:    { value: "optimalControl" }, // optimalControl | priorityControl | maintenance
+
+      // Same-time landing (rendezvous planner). When ON the planner
+      // delays each pump's move so all pumps reach their setpoint at
+      // the same wall-clock instant t* = max(eta_i). When OFF each
+      // pump moves at its own pace and lands at its own eta.
+      useRendezvous: { value: true },
+
       //define asset properties
       uuid: { value: "" },
       supplier: { value: "" },
@@ -40,7 +90,7 @@
       distance: { value: 0 },
       distanceUnit: { value: "m" },
       distanceDescription: { value: "" }
-      
+
     },
         inputs:1,
         outputs:3, 
@@ -52,10 +102,17 @@
             return (this.positionIcon || "") + " machineGroup";
         },
         oneditprepare: function() {
-            // Initialize the menu data for the node
+            const self = this;
+            // Initialize the menu data for the node, then the visual modules.
+            // Both attach to window.EVOLV.nodes.machineGroupControl.* — the
+            // menu endpoint populates loggerMenu/positionMenu/initEditor; the
+            // editor scripts populate editor.modeCards/rendezvousToggle/compactFields.
             const waitForMenuData = () => {
                 if (window.EVOLV?.nodes?.machineGroupControl?.initEditor) {
-                    window.EVOLV.nodes.machineGroupControl.initEditor(this);
+                    window.EVOLV.nodes.machineGroupControl.initEditor(self);
+                    if (window.EVOLV.nodes.machineGroupControl.editor?.initVisuals) {
+                        window.EVOLV.nodes.machineGroupControl.editor.initVisuals(self);
+                    }
                 } else {
                     setTimeout(waitForMenuData, 50);
                 }
@@ -84,23 +141,49 @@
 
 <script type="text/html" data-template-name="machineGroupControl">
 
+  <h3>Control strategy</h3>
+  <!-- Hidden input is the canonical Node-RED-readable field. The visible
+       picker is rendered by src/editor/mode-cards.js into the placeholder
+       below, and clicks on a card write back to this input. -->
+  <input type="hidden" id="node-input-mode" />
+  <div id="mgc-mode-cards" class="mgc-mode-cards"
+       role="radiogroup" aria-label="Control strategy mode">
+    <!-- mode-cards.js renders three card divs here -->
+  </div>
+  <hr class="mgc-section-divider" />
+
+  <h3>Rendezvous planner</h3>
+  <div class="form-row mgc-toggle-row">
+    <input type="checkbox" id="node-input-useRendezvous" class="mgc-hidden-checkbox" />
+    <div id="mgc-rendezvous-toggle" class="mgc-toggle-card"
+         role="switch" tabindex="0" aria-label="Same-time landing"
+         aria-checked="false" title="Same-time landing"></div>
+  </div>
+  <hr class="mgc-section-divider" />
+
   <h3>Output Formats</h3>
-  <div class="form-row">
+  <div class="form-row mgc-output-row">
     <label for="node-input-processOutputFormat"><i class="fa fa-random"></i> Process Output</label>
-    <select id="node-input-processOutputFormat" style="width:60%;">
+    <select id="node-input-processOutputFormat" class="evolv-native-hidden" style="width:60%;">
       <option value="process">process</option>
       <option value="json">json</option>
       <option value="csv">csv</option>
     </select>
+    <div id="mgc-process-output-picker" class="evolv-icon-picker"
+         role="radiogroup" aria-label="Process output format"></div>
   </div>
-  <div class="form-row">
+  <div class="form-row mgc-output-row">
     <label for="node-input-dbaseOutputFormat"><i class="fa fa-database"></i> Database Output</label>
-    <select id="node-input-dbaseOutputFormat" style="width:60%;">
+    <select id="node-input-dbaseOutputFormat" class="evolv-native-hidden" style="width:60%;">
       <option value="influxdb">influxdb</option>
+      <option value="frost">frost</option>
       <option value="json">json</option>
       <option value="csv">csv</option>
     </select>
+    <div id="mgc-dbase-output-picker" class="evolv-icon-picker"
+         role="radiogroup" aria-label="Database output format"></div>
   </div>
+  <hr class="mgc-section-divider" />
 
   <!-- Logger fields injected here -->
   <div id="logger-fields-placeholder"></div>

mgc.js

@@ -1,4 +1,5 @@
 const nameOfNode = 'machineGroupControl'; // this is the name of the node, it should match the file name and the node type in Node-RED
+const path = require('path');
 const nodeClass = require('./src/nodeClass.js'); // this is the specific node class
 const { MenuManager, configManager } = require('generalFunctions');
 
@@ -36,4 +37,16 @@ module.exports = function(RED) {
       res.status(500).send(`// Error generating configData: ${err.message}`);
     }
   });
+
+  // Editor JS modules — loaded by mgc.html via <script src="/machineGroupControl/editor/*.js">.
+  // Files live in src/editor/. Filename restricted to a safe charset to prevent
+  // path-traversal. Mirrors pumpingStation.js:44-51.
+  RED.httpAdmin.get(`/${nameOfNode}/editor/:file`, (req, res) => {
+    const safe = String(req.params.file || '').replace(/[^a-zA-Z0-9._-]/g, '');
+    if (!safe.endsWith('.js')) return res.status(400).send('// invalid');
+    res.type('application/javascript');
+    res.sendFile(path.join(__dirname, 'src', 'editor', safe), (err) => {
+      if (err && !res.headersSent) res.status(404).send('// editor module not found');
+    });
+  });
 };

package.json

@@ -4,7 +4,10 @@
   "description": "Control module machineGroupControl",
   "main": "mgc.js",
   "scripts": {
-    "test": "node --test test/basic/*.test.js test/integration/*.test.js test/edge/*.test.js"
+    "test": "node --test test/basic/*.test.js test/integration/*.test.js test/edge/*.test.js",
+    "wiki:contract":  "node ../generalFunctions/scripts/wikiGen.js contract  ./src/commands/index.js   --write ./wiki/Home.md",
+    "wiki:datamodel": "node ../generalFunctions/scripts/wikiGen.js datamodel ./src/specificClass.js     --write ./wiki/Home.md",
+    "wiki:all":       "npm run wiki:contract && npm run wiki:datamodel"
   },
   "repository": {
     "type": "git",

src/combinatorics/pumpCombinations.js

@@ -0,0 +1,96 @@
+// Pure subset/combination generators used by the optimizer.
+// All callable through `ctx` so this file stays free of class state.
+// `ctx` must provide:
+//   - groupCurves: { groupFlow, groupPower } (from ../groupOps/groupCurves)
+//   - logger (warn/debug)
+//   - readChildMeasurement(machine, type, variant, position, canonicalUnit)
+//   - POSITIONS, unitPolicy.canonical.flow
+
+const EXCLUDED_STATES = new Set(['off', 'coolingdown', 'stopping', 'emergencystop']);
+
+// Reduce demand by the flow that manually-driven operational machines
+// are already delivering. Returns the adjusted Qd (may be < 0).
+function checkSpecialCases(machines, Qd, ctx) {
+    const { logger, readChildMeasurement, POSITIONS, unitPolicy } = ctx;
+    const canonicalFlow = unitPolicy?.canonical?.flow;
+
+    Object.values(machines).forEach(machine => {
+        const state = machine.state?.getCurrentState?.();
+        const mode = machine.currentMode;
+
+        if (state !== 'operational') return;
+        if (mode !== 'virtualControl' && mode !== 'fysicalControl') return;
+
+        const measuredFlow = readChildMeasurement
+            ? readChildMeasurement(machine, 'flow', 'measured', POSITIONS.DOWNSTREAM, canonicalFlow)
+            : undefined;
+        const predictedFlow = readChildMeasurement
+            ? readChildMeasurement(machine, 'flow', 'predicted', POSITIONS.DOWNSTREAM, canonicalFlow)
+            : undefined;
+
+        let flow = 0;
+        if (Number.isFinite(measuredFlow) && measuredFlow !== 0) {
+            flow = measuredFlow;
+        } else if (Number.isFinite(predictedFlow) && predictedFlow !== 0) {
+            flow = predictedFlow;
+        } else {
+            // Unrecoverable: a machine is producing flow we can't quantify.
+            // Caller decides whether to abort the dispatch tick.
+            logger?.error?.(
+                "Dont perform calculation at all seeing that there is a machine working but we dont know the flow its producing"
+            );
+            return;
+        }
+
+        Qd = Qd - flow;
+    });
+    return Qd;
+}
+
+// Generate all non-empty machine subsets that can deliver Qd within powerCap.
+// Inputs that can't possibly contribute (off / coolingdown / mode-locked) are
+// excluded before the power set is built, so 2^N stays small in practice.
+function validPumpCombinations(machines, Qd, ctx, powerCap = Infinity) {
+    const { groupCurves } = ctx;
+    const groupFlow = groupCurves?.groupFlow;
+    const groupPower = groupCurves?.groupPower;
+
+    Qd = checkSpecialCases(machines, Qd, ctx);
+
+    let subsets = [[]];
+    Object.keys(machines).forEach(machineId => {
+        const machine = machines[machineId];
+        const state = machine.state?.getCurrentState?.();
+        const validActionForMode =
+            typeof machine.isValidActionForMode === 'function'
+                ? machine.isValidActionForMode('execsequence', 'auto')
+                : true;
+
+        if (EXCLUDED_STATES.has(state) || !validActionForMode) return;
+
+        const newSubsets = subsets.map(set => [...set, machineId]);
+        subsets = subsets.concat(newSubsets);
+    });
+
+    return subsets.filter(subset => {
+        if (subset.length === 0) return false;
+
+        const { maxFlow, minFlow, maxPower } = subset.reduce(
+            (acc, machineId) => {
+                const machine = machines[machineId];
+                const f = groupFlow(machine);
+                const p = groupPower(machine);
+                return {
+                    maxFlow: acc.maxFlow + f.currentFxyYMax,
+                    minFlow: acc.minFlow + f.currentFxyYMin,
+                    maxPower: acc.maxPower + p.currentFxyYMax,
+                };
+            },
+            { maxFlow: 0, minFlow: 0, maxPower: 0 },
+        );
+
+        return maxFlow >= Qd && minFlow <= Qd && maxPower <= powerCap;
+    });
+}
+
+module.exports = { validPumpCombinations, checkSpecialCases, EXCLUDED_STATES };

src/commands/handlers.js

@@ -0,0 +1,104 @@
+'use strict';
+
+// Handler functions for machineGroupControl commands. Each handler receives:
+//   source: the domain (specificClass) instance — exposes setMode,
+//           handleInput, childRegistrationUtils.registerChild, logger,
+//           config.general.name.
+//   msg:    the Node-RED input message.
+//   ctx:    { node, RED, send, logger } — provided by BaseNodeAdapter.
+//
+// Pure functions: no module-level state. The registry already enforces the
+// typeof-check ladder; per-topic semantic validation lives here.
+
+function _logger(source, ctx) {
+  return ctx?.logger || source?.logger || null;
+}
+
+// Gate one command against the mode-allowed action and source allow-lists.
+// Returns true if both gates pass (or if the source lacks the gate methods —
+// keeps backward compat with fakes/specifics that haven't adopted the pattern
+// yet). When a gate fails the source already warn-logs; we just bail out.
+function _gate(source, action, msg) {
+  if (typeof source?.isValidActionForMode === 'function') {
+    if (!source.isValidActionForMode(action, source.mode)) return false;
+  }
+  if (typeof source?.isValidSourceForMode === 'function') {
+    const src = (typeof msg?.source === 'string' && msg.source) ? msg.source : 'parent';
+    if (!source.isValidSourceForMode(src, source.mode)) return false;
+  }
+  return true;
+}
+
+exports.setMode = (source, msg) => {
+  // set.mode is a status-level operation — allowed in every mode by the
+  // default schema (incl. maintenance). The gate still fires so an
+  // unauthorised source is rejected even for mode switching.
+  if (!_gate(source, 'statusCheck', msg)) return;
+  source.setMode(msg.payload);
+};
+
+exports.registerChild = (source, msg, ctx) => {
+  if (!_gate(source, 'statusCheck', msg)) return;
+  const log = _logger(source, ctx);
+  const childId = msg.payload;
+  const childObj = ctx?.RED?.nodes?.getNode?.(childId);
+  if (!childObj || !childObj.source) {
+    log?.warn?.(`registerChild: child '${childId}' not found or has no .source`);
+    return;
+  }
+  source.childRegistrationUtils.registerChild(childObj.source, msg.positionVsParent);
+};
+
+exports.setDemand = async (source, msg, ctx) => {
+  const log = _logger(source, ctx);
+  // Operator demand is self-describing: the unit on the message decides how
+  // the value is interpreted. There is no persistent scaling state on MGC.
+  //
+  //   payload = number             → unit defaults to '%'
+  //   payload = { value, unit:'%' }→ percent of group capacity
+  //   payload = { value, unit:'m3/h' | 'l/s' | 'm3/s' | ... } → absolute flow
+  //   payload < 0 (any unit)       → operator stop-all signal
+  //
+  // Unit resolution + canonical dispatch lives in source.setDemand. The
+  // handler's job is payload parsing, mode gating, and the "done" reply.
+  const p = msg?.payload;
+  let rawValue;
+  let unit;
+  if (p !== null && typeof p === 'object') {
+    rawValue = p.value;
+    unit = (typeof p.unit === 'string' && p.unit.trim()) ? p.unit.trim() : '%';
+  } else {
+    rawValue = p;
+    unit = '%';
+  }
+  const value = Number(rawValue);
+  if (!Number.isFinite(value)) {
+    log?.error?.(`set.demand: invalid Qd value '${JSON.stringify(msg?.payload)}'`);
+    return;
+  }
+  // Gate the demand against the current mode. Action kind depends on whether
+  // this is a stop-all (negative) or a dispatch — the schema declares which
+  // are accepted per mode (maintenance gets neither). Done after numeric
+  // parse so an unparseable payload is still surfaced as an error, not a
+  // silent mode-rejection.
+  let action;
+  if (value < 0) action = 'emergencyStop';
+  else if (source?.mode === 'priorityControl') action = 'execSequentialControl';
+  else action = 'execOptimalCombination';
+  if (!_gate(source, action, msg)) return;
+  try {
+    await source.setDemand(value, unit);
+  } catch (err) {
+    log?.error?.(`set.demand: failed to process Qd: ${err && err.message}`);
+    return;
+  }
+  // Reply on Port 0 with the configured node name as topic — preserves the
+  // legacy "done" handshake some downstream flows rely on.
+  if (typeof ctx?.send === 'function') {
+    const reply = Object.assign({}, msg, {
+      topic: source?.config?.general?.name,
+      payload: 'done',
+    });
+    ctx.send(reply);
+  }
+};

src/commands/index.js

@@ -0,0 +1,38 @@
+'use strict';
+
+// machineGroupControl command registry. Consumed by BaseNodeAdapter via
+// `static commands = require('./commands')`. Each descriptor maps a
+// canonical msg.topic to its handler; legacy names are listed under
+// `aliases` and emit a one-time deprecation warning at runtime.
+
+const handlers = require('./handlers');
+
+module.exports = [
+  {
+    topic: 'set.mode',
+    aliases: ['setMode'],
+    payloadSchema: { type: 'string' },
+    description: 'Switch the operating mode. Allowed: `optimalControl`, `priorityControl`, `maintenance` (schema-validated in `machineGroupControl.json` → `mode.current`).',
+    handler: handlers.setMode,
+  },
+  {
+    topic: 'child.register',
+    aliases: ['registerChild'],
+    // payload is the Node-RED id (string) of the child node.
+    payloadSchema: { type: 'string' },
+    description: 'Register a child machine with this group.',
+    handler: handlers.registerChild,
+  },
+  {
+    topic: 'set.demand',
+    aliases: ['Qd'],
+    // payload is either a bare number (interpreted as %) or
+    // { value: number, unit: '%' | 'm3/h' | 'l/s' | 'm3/s' | ... }.
+    // No `units` descriptor — the handler resolves the unit explicitly so
+    // commandRegistry._normaliseUnits doesn't pre-convert a percentage into
+    // a flow rate. Negative value is the operator stop-all signal.
+    payloadSchema: { type: 'any' },
+    description: 'Operator demand setpoint. Bare number = %; {value, unit} for absolute flow units. Negative = stop all.',
+    handler: handlers.setDemand,
+  },
+];

src/control/strategies.js

@@ -0,0 +1,182 @@
+'use strict';
+
+// Priority-based control strategies for machineGroupControl.
+//
+// equalFlowControl: distribute demand equally across priority-ordered active
+// machines, falling back to start/stop the next priority when the current
+// active set can't deliver.
+//
+// Extracted from specificClass during the P4 refactor; the orchestrator
+// wires it in via the strategies map below. It depends on the same
+// group-curve helpers the optimizer uses, so allocation and power
+// evaluation stay on the equalised group operating point.
+
+const { POSITIONS } = require('generalFunctions');
+const { groupFlow, groupCalcPower } = require('../groupOps/groupCurves');
+
+function sortMachinesByPriority(machines, priorityList) {
+    if (priorityList && Array.isArray(priorityList)) {
+        return priorityList
+            .filter(id => machines[id])
+            .map(id => ({ id, machine: machines[id] }));
+    }
+    return Object.entries(machines)
+        .map(([id, machine]) => ({ id, machine }))
+        .sort((a, b) => a.id - b.id);
+}
+
+function filterOutUnavailableMachines(list) {
+    return list.filter(({ machine }) => {
+        const state = machine.state.getCurrentState();
+        const validActionForMode = machine.isValidActionForMode('execsequence', 'auto');
+        return !(state === 'off' || state === 'coolingdown' || state === 'stopping'
+            || state === 'emergencystop' || !validActionForMode);
+    });
+}
+
+function capFlowDemand(Qd, dynamicTotals, logger) {
+    if (Qd < dynamicTotals.flow.min && Qd > 0) {
+        logger?.warn?.(`Flow demand ${Qd} below min ${dynamicTotals.flow.min}; capping.`);
+        return dynamicTotals.flow.min;
+    }
+    if (Qd > dynamicTotals.flow.max) {
+        logger?.warn?.(`Flow demand ${Qd} above max ${dynamicTotals.flow.max}; capping.`);
+        return dynamicTotals.flow.max;
+    }
+    return Qd;
+}
+
+// Pure distribution math: given the demand, group envelope, priority list, and
+// per-machine curve helpers, return the {machineId, flow} mapping plus running
+// totals. No side effects, no mgc reference — testable without an MGC fixture.
+//
+// Inputs:
+//   machines:        dict {id → machine} (machine objects need group-curve fields set)
+//   Qd:              demand in canonical m³/s
+//   dynamicTotals:   {flow: {min, max}}   — envelope across ALL registered pumps
+//   activeTotals:    {flow: {min, max}}   — envelope across currently-active pumps
+//   priorityList:    optional array of ids; null = default ordering
+//   isMachineActive: (id) → boolean (state-aware predicate)
+//   groupFlow:       (machine) → {currentFxyYMin, currentFxyYMax}
+//   groupCalcPower:  (machine, flow) → number (W)
+//   logger:          { warn, error, … } or null
+//
+// Returns: { flowDistribution: [{machineId, flow}], totalFlow, totalPower, totalCog }
+function computeEqualFlowDistribution({
+    machines, Qd, dynamicTotals, activeTotals, priorityList,
+    isMachineActive, groupFlow, groupCalcPower, logger,
+}) {
+    Qd = capFlowDemand(Qd, dynamicTotals, logger);
+
+    let machinesInPriorityOrder = sortMachinesByPriority(machines, priorityList);
+    machinesInPriorityOrder = filterOutUnavailableMachines(machinesInPriorityOrder);
+
+    const flowDistribution = [];
+    let totalFlow = 0;
+    let totalPower = 0;
+    // Equal-flow doesn't compute a meaningful cog — only BEP-Gravitation does.
+    // Preserved at 0 for backwards-compat; pinned by a basic test so a future
+    // change that introduces a fake non-zero value will fail loudly.
+    const totalCog = 0;
+
+    switch (true) {
+        case (Qd < activeTotals.flow.min && activeTotals.flow.min !== 0): {
+            let availableFlow = activeTotals.flow.min;
+            for (let i = machinesInPriorityOrder.length - 1; i >= 0 && availableFlow > Qd; i--) {
+                const m = machinesInPriorityOrder[i];
+                if (isMachineActive(m.id)) {
+                    flowDistribution.push({ machineId: m.id, flow: 0 });
+                    availableFlow -= groupFlow(m.machine).currentFxyYMin;
+                }
+            }
+            const remaining = machinesInPriorityOrder.filter(({ id }) =>
+                isMachineActive(id) && !flowDistribution.some(it => it.machineId === id));
+            const distributedFlow = Qd / remaining.length;
+            for (const m of remaining) {
+                flowDistribution.push({ machineId: m.id, flow: distributedFlow });
+                totalFlow += distributedFlow;
+                totalPower += groupCalcPower(m.machine, distributedFlow);
+            }
+            break;
+        }
+        case (Qd > activeTotals.flow.max): {
+            let i = 1;
+            while (totalFlow < Qd && i <= machinesInPriorityOrder.length) {
+                Qd = Qd / i;
+                if (groupFlow(machinesInPriorityOrder[i - 1].machine).currentFxyYMax >= Qd) {
+                    for (let i2 = 0; i2 < i; i2++) {
+                        if (!isMachineActive(machinesInPriorityOrder[i2].id)) {
+                            flowDistribution.push({ machineId: machinesInPriorityOrder[i2].id, flow: Qd });
+                            totalFlow += Qd;
+                            totalPower += groupCalcPower(machinesInPriorityOrder[i2].machine, Qd);
+                        }
+                    }
+                }
+                i++;
+            }
+            break;
+        }
+        default: {
+            const countActive = machinesInPriorityOrder.filter(({ id }) => isMachineActive(id)).length;
+            Qd /= countActive;
+            for (let i = 0; i < countActive; i++) {
+                flowDistribution.push({ machineId: machinesInPriorityOrder[i].id, flow: Qd });
+                totalFlow += Qd;
+                totalPower += groupCalcPower(machinesInPriorityOrder[i].machine, Qd);
+            }
+            break;
+        }
+    }
+
+    return { flowDistribution, totalFlow, totalPower, totalCog };
+}
+
+// Orchestrator: equalize the operating point, call the pure distribution math,
+// write outputs, dispatch children. The mgc reaches happen here, not in the
+// algorithm — see computeEqualFlowDistribution above for the part that's
+// testable in isolation.
+async function equalFlowControl(ctx, Qd, _powerCap = Infinity, priorityList = null) {
+    const { mgc } = ctx;
+    try {
+        mgc.equalizePressure();
+        const dynamicTotals = mgc.calcDynamicTotals();
+        const activeTotals = mgc.totals.activeTotals();
+
+        const { flowDistribution, totalFlow, totalPower, totalCog } = computeEqualFlowDistribution({
+            machines: mgc.machines,
+            Qd, dynamicTotals, activeTotals, priorityList,
+            isMachineActive: (id) => mgc.isMachineActive(id),
+            groupFlow, groupCalcPower,
+            logger: mgc.logger,
+        });
+
+        const pUnit = mgc.unitPolicy.canonical.power;
+        const fUnit = mgc.unitPolicy.canonical.flow;
+        mgc.operatingPoint.writeOwn('power', 'predicted', POSITIONS.AT_EQUIPMENT, totalPower, pUnit);
+        mgc.operatingPoint.writeOwn('flow',  'predicted', POSITIONS.AT_EQUIPMENT, totalFlow,  fUnit);
+        // Hydraulic efficiency η = (Q·ΔP)/P_shaft, same scale as child cogs.
+        const dP = mgc.operatingPoint.headerDiffPa;
+        if (Number.isFinite(dP) && dP > 0 && totalPower > 0) {
+            mgc.measurements.type('efficiency').variant('predicted').position(POSITIONS.AT_EQUIPMENT)
+                .value((totalFlow * dP) / totalPower);
+        }
+        mgc.measurements.type('Ncog').variant('predicted').position(POSITIONS.AT_EQUIPMENT).value(totalCog);
+
+        // Route the chosen distribution through the shared planner/executor
+        // path. With planner.useRendezvous=true (the default) all pumps
+        // reach their per-pump flow target at the same wall-clock instant;
+        // with it false, every command fires at tick 0 — same effect as
+        // the legacy Promise.all dispatch but with correct startup/shutdown
+        // ordering (the planner emits execsequence BEFORE flowmovement for
+        // idle pumps, where the legacy code emitted them in the opposite
+        // order and relied on the pump's delayedMove queue to recover).
+        await mgc._dispatchFlowDistribution(flowDistribution);
+    } catch (err) {
+        mgc.logger?.error?.(err);
+    }
+}
+
+module.exports = {
+    equalFlowControl, computeEqualFlowDistribution,
+    capFlowDemand, sortMachinesByPriority, filterOutUnavailableMachines,
+};

src/dispatch/demandDispatcher.js

@@ -0,0 +1,53 @@
+'use strict';
+
+const { LatestWinsGate } = require('generalFunctions');
+
+// Thin wrapper around LatestWinsGate for the MGC demand path. Replaces
+// the original `_dispatchInFlight` + `_delayedCall` pair in
+// specificClass.handleInput: a new demand arriving while a dispatch is
+// in flight overwrites any pending one, so the latest value always wins
+// and intermediates are dropped silently.
+
+class DemandDispatcher {
+    constructor(ctx = {}, runFn) {
+        if (typeof runFn !== 'function') {
+            throw new TypeError('DemandDispatcher requires a runFn');
+        }
+        this.ctx = ctx;
+        this.logger = ctx.logger || null;
+        this._runFn = runFn;
+        this._gate = new LatestWinsGate(
+            async (demand) => this._runFn(demand, this.ctx),
+            { logger: this.logger },
+        );
+    }
+
+    fire(demand) {
+        this._gate.fire(demand);
+    }
+
+    // Returns a promise that resolves when THIS demand's dispatch settles.
+    // If superseded by a later fireAndWait while parked, the promise
+    // resolves with the LatestWinsGate SUPERSEDED sentinel
+    // ({ superseded: true }) — callers can branch on it without try/catch.
+    fireAndWait(demand) {
+        return this._gate.fireAndWait(demand);
+    }
+
+    drain() {
+        return this._gate.drain();
+    }
+
+    // Cancels any parked pending value so it cannot run. The currently
+    // in-flight dispatch (if any) still runs to completion. A parked
+    // fireAndWait promise resolves with the SUPERSEDED sentinel.
+    cancelPending() {
+        if (this._gate._pending) this._gate._supersedePending();
+    }
+
+    get inFlight() {
+        return this._gate.size > 0;
+    }
+}
+
+module.exports = DemandDispatcher;

src/editor/compact-fields.js

@@ -0,0 +1,94 @@
+// compact-fields.js — MGC-only output-format icon picker.
+//
+// Logger toggle/level and physical-position visuals now live in the shared
+// generalFunctions/src/menu/iconHelpers.js (auto-injected by MenuManager), so
+// the only MGC-local visuals left are the two output-format dropdowns
+// (processOutputFormat, dbaseOutputFormat) — those fields aren't part of any
+// shared menu.
+
+(function () {
+  const editor = window.EVOLV?.nodes?.machineGroupControl?.editor;
+  if (!editor) return;
+
+  const BLUE = '#1F4E79';
+  const STEEL = '#607484';
+
+  // MGC-only SVGs (output formats only — logger/position SVGs come from
+  // window.EVOLV.iconHelpers.SVG).
+  const SVG = {
+    process: `
+      <svg viewBox="0 0 80 58" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+        <rect x="10" y="14" width="20" height="30" rx="2" fill="#f7fafc" stroke="${STEEL}" stroke-width="2.4"/>
+        <rect x="50" y="14" width="20" height="30" rx="2" fill="#f7fafc" stroke="${STEEL}" stroke-width="2.4"/>
+        <line x1="30" y1="29" x2="46" y2="29" stroke="${BLUE}" stroke-width="3" stroke-linecap="round"/>
+        <path d="M42 24 L48 29 L42 34" fill="none" stroke="${BLUE}" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
+      </svg>`,
+    json: `
+      <svg viewBox="0 0 80 58" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+        <g fill="none" stroke="${BLUE}" stroke-width="3.4" stroke-linecap="round" stroke-linejoin="round">
+          <path d="M30 14 C22 16 22 26 27 29 C22 32 22 42 30 44"/>
+          <path d="M50 14 C58 16 58 26 53 29 C58 32 58 42 50 44"/>
+        </g>
+        <g fill="${STEEL}">
+          <circle cx="36" cy="29" r="2.2"/>
+          <circle cx="44" cy="29" r="2.2"/>
+        </g>
+      </svg>`,
+    csv: `
+      <svg viewBox="0 0 80 58" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+        <rect x="12" y="12" width="56" height="34" rx="2" fill="#fff" stroke="${STEEL}" stroke-width="2.4"/>
+        <line x1="12" y1="22" x2="68" y2="22" stroke="${STEEL}" stroke-width="2"/>
+        <g stroke="${STEEL}" stroke-width="1.6">
+          <line x1="12" y1="34" x2="68" y2="34"/>
+          <line x1="31" y1="12" x2="31" y2="46"/>
+          <line x1="49" y1="12" x2="49" y2="46"/>
+        </g>
+      </svg>`,
+    influxdb: `
+      <svg viewBox="0 0 80 58" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+        <ellipse cx="40" cy="15" rx="22" ry="6" fill="#f7fafc" stroke="${STEEL}" stroke-width="2.4"/>
+        <path d="M18 15 V42 C18 46 28 49 40 49 C52 49 62 46 62 42 V15" fill="#f7fafc" stroke="${STEEL}" stroke-width="2.4"/>
+        <path d="M18 28 C26 32 54 32 62 28" fill="none" stroke="${STEEL}" stroke-width="1.6" opacity="0.6"/>
+        <path d="M22 39 L30 32 L38 41 L46 34 L54 38" fill="none" stroke="${BLUE}" stroke-width="2.6" stroke-linecap="round" stroke-linejoin="round"/>
+      </svg>`,
+  };
+
+  const outputIcons = {
+    process: SVG.process,
+    json: SVG.json,
+    csv: SVG.csv,
+    influxdb: SVG.influxdb,
+    frost: SVG.influxdb,
+  };
+
+  const outputLabels = {
+    process: 'Process',
+    json: 'JSON',
+    csv: 'CSV',
+    influxdb: 'Influx',
+    frost: 'FROST',
+  };
+
+  function initOutputFormats() {
+    const helpers = window.EVOLV?.iconHelpers;
+    if (!helpers) return;
+
+    const processSelect = document.getElementById('node-input-processOutputFormat');
+    const processHolder = document.getElementById('mgc-process-output-picker');
+    if (processSelect && processHolder) {
+      helpers.renderSelectPicker(processSelect, processHolder, outputIcons, outputLabels);
+    }
+
+    const dbaseSelect = document.getElementById('node-input-dbaseOutputFormat');
+    const dbaseHolder = document.getElementById('mgc-dbase-output-picker');
+    if (dbaseSelect && dbaseHolder) {
+      helpers.renderSelectPicker(dbaseSelect, dbaseHolder, outputIcons, outputLabels);
+    }
+  }
+
+  function init() {
+    initOutputFormats();
+  }
+
+  editor.compactFields = { init };
+})();

src/editor/index.js

@@ -0,0 +1,34 @@
+// machineGroupControl editor — namespace bootstrap.
+//
+// Attaches the editor's submodule registry to the shared
+// window.EVOLV.nodes.machineGroupControl namespace (same one the menuManager
+// and configManager endpoints populate). Each sibling module in this
+// directory (mode-cards.js, demand-contract.js, oneditprepare.js) registers
+// itself by writing additional members onto this namespace.
+//
+// Loaded first by mgc.html — must not depend on any other src/editor module.
+
+(function () {
+  const root = window.EVOLV = window.EVOLV || {};
+  const nodes = root.nodes = root.nodes || {};
+  const ns = nodes.machineGroupControl = nodes.machineGroupControl || {};
+  const editor = ns.editor = ns.editor || {};
+
+  // Pub/sub for mode changes — mode-cards.js fires, anything that wants to
+  // re-render on mode change subscribes. Keep it tiny; no third-party emitter.
+  const modeListeners = [];
+  editor.onModeChange = (cb) => { if (typeof cb === 'function') modeListeners.push(cb); };
+  editor.emitModeChange = (newMode) => {
+    for (const cb of modeListeners) {
+      try { cb(newMode); } catch (e) { /* swallow — UI helper */ }
+    }
+  };
+
+  // Read the currently selected mode from the hidden input that mode-cards.js
+  // keeps in sync with the active card. Falls back to optimalControl if the
+  // input isn't on the page yet (race against oneditprepare).
+  editor.getMode = () => {
+    const el = document.getElementById('node-input-mode');
+    return (el && el.value) || 'optimalControl';
+  };
+})();

src/editor/mode-cards.js

@@ -0,0 +1,139 @@
+// mode-cards.js — visual pickers for control-strategy modes and planner flags.
+//
+// Replaces the plain mode field with compact illustrated controls. The
+// original inputs stay in the DOM but are hidden — Node-RED reads their values
+// on save, exactly as before.
+//
+// SVGs are inline so the editor doesn't need to fetch additional assets.
+
+(function () {
+  const editor = window.EVOLV?.nodes?.machineGroupControl?.editor;
+  if (!editor) return;
+
+  const MODES = [
+    {
+      value: 'optimalControl',
+      ariaLabel: 'Optimal control',
+      label: 'Most-efficient',
+      svg: `
+        <svg viewBox="0 0 120 72" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+          <line x1="12" y1="60" x2="112" y2="60" stroke="#888" stroke-width="1.4" stroke-linecap="round"/>
+          <line x1="12" y1="60" x2="12" y2="10" stroke="#888" stroke-width="1.4" stroke-linecap="round"/>
+          <path d="M 16 60 Q 62 -30 108 60" fill="none" stroke="#1E8449" stroke-width="3" stroke-linecap="round"/>
+          <line x1="62" y1="15" x2="62" y2="60" stroke="#1F4E79" stroke-dasharray="3 3" stroke-width="1.2"/>
+          <circle cx="62" cy="15" r="5.5" fill="#1E8449" stroke="#fff" stroke-width="1.6"/>
+        </svg>`,
+    },
+    {
+      value: 'priorityControl',
+      ariaLabel: 'Priority control',
+      label: 'Priority',
+      svg: `
+        <svg viewBox="0 0 120 72" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+          <line x1="12" y1="60" x2="112" y2="60" stroke="#888" stroke-width="1.4" stroke-linecap="round"/>
+          <line x1="12" y1="60" x2="12" y2="10" stroke="#888" stroke-width="1.4" stroke-linecap="round"/>
+          <polyline points="14,54 38,54 38,40 62,40 62,26 86,26 86,14 110,14"
+                    fill="none" stroke="#1F4E79" stroke-width="3" stroke-linejoin="round" stroke-linecap="round"/>
+        </svg>`,
+    },
+    {
+      value: 'maintenance',
+      ariaLabel: 'Maintenance',
+      label: 'Maintenance',
+      svg: `<i class="fa fa-wrench" style="font-size:40px;color:#607484;" aria-hidden="true"></i>`,
+    },
+  ];
+
+  const RENDEZVOUS_SVG = `
+    <svg viewBox="0 0 120 72" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+      <line x1="12" y1="60" x2="112" y2="60" stroke="#888" stroke-width="1.4" stroke-linecap="round"/>
+      <line x1="12" y1="60" x2="12" y2="10" stroke="#888" stroke-width="1.4" stroke-linecap="round"/>
+      <line x1="96" y1="12" x2="96" y2="60" stroke="#1F4E79" stroke-dasharray="3 3" stroke-width="1.4"/>
+      <path d="M 18 52 C 38 50, 64 38, 96 20" fill="none" stroke="#1E8449" stroke-width="2.6" stroke-linecap="round"/>
+      <path d="M 18 58 C 40 56, 64 42, 96 20" fill="none" stroke="#50a8d9" stroke-width="2.6" stroke-linecap="round"/>
+      <path d="M 18 44 C 42 44, 66 34, 96 20" fill="none" stroke="#C0392B" stroke-width="2.6" stroke-linecap="round"/>
+      <circle cx="96" cy="20" r="6" fill="#1F4E79" stroke="#fff" stroke-width="1.6"/>
+    </svg>`;
+
+  // Render the three cards into the placeholder div. The hidden input stays
+  // intact; the card click handler writes its value back so Node-RED's save
+  // path is unchanged.
+  function init(/* node */) {
+    const placeholder = document.getElementById('mgc-mode-cards');
+    const hidden = document.getElementById('node-input-mode');
+    if (!placeholder || !hidden) return;
+
+    placeholder.innerHTML = MODES.map((m) => `
+      <div class="mgc-mode-card" data-mode="${m.value}" role="radio" tabindex="0"
+           aria-label="${m.ariaLabel}" aria-checked="false" title="${m.ariaLabel}">
+        <div class="mgc-mode-card-svg">${m.svg}</div>
+        <div class="mgc-mode-card-label">${m.label}</div>
+      </div>
+    `).join('');
+
+    const cards = Array.from(placeholder.querySelectorAll('.mgc-mode-card'));
+    function syncHighlight() {
+      const current = hidden.value || 'optimalControl';
+      for (const c of cards) {
+        const on = c.getAttribute('data-mode') === current;
+        c.classList.toggle('mgc-mode-card-on', on);
+        c.setAttribute('aria-checked', String(on));
+      }
+    }
+    function pick(mode) {
+      hidden.value = mode;
+      // Fire change so any other listener bound to the input (Node-RED's
+      // dirty-tracker, plus our pub/sub) sees the update.
+      hidden.dispatchEvent(new Event('change', { bubbles: true }));
+      syncHighlight();
+      editor.emitModeChange(mode);
+    }
+    for (const c of cards) {
+      c.addEventListener('click', () => pick(c.getAttribute('data-mode')));
+      c.addEventListener('keydown', (e) => {
+        if (e.key === ' ' || e.key === 'Enter') {
+          e.preventDefault();
+          pick(c.getAttribute('data-mode'));
+        }
+      });
+    }
+    syncHighlight();
+  }
+
+  function initRendezvousToggle(/* node */) {
+    const placeholder = document.getElementById('mgc-rendezvous-toggle');
+    const checkbox = document.getElementById('node-input-useRendezvous');
+    if (!placeholder || !checkbox) return;
+
+    placeholder.innerHTML = `
+      <div class="mgc-toggle-card-svg">${RENDEZVOUS_SVG}</div>
+      <div class="mgc-toggle-card-label">Inactive</div>
+    `;
+    const labelEl = placeholder.querySelector('.mgc-toggle-card-label');
+
+    function syncHighlight() {
+      const on = checkbox.checked;
+      placeholder.classList.toggle('mgc-toggle-card-on', on);
+      placeholder.setAttribute('aria-checked', String(on));
+      if (labelEl) labelEl.textContent = on ? 'Active' : 'Inactive';
+    }
+    function toggle() {
+      checkbox.checked = !checkbox.checked;
+      checkbox.dispatchEvent(new Event('change', { bubbles: true }));
+      syncHighlight();
+    }
+
+    placeholder.addEventListener('click', toggle);
+    placeholder.addEventListener('keydown', (e) => {
+      if (e.key === ' ' || e.key === 'Enter') {
+        e.preventDefault();
+        toggle();
+      }
+    });
+    checkbox.addEventListener('change', syncHighlight);
+    syncHighlight();
+  }
+
+  editor.modeCards = { init };
+  editor.rendezvousToggle = { init: initRendezvousToggle };
+})();

src/editor/oneditprepare.js

@@ -0,0 +1,22 @@
+// oneditprepare.js — initialise the editor's visual modules.
+//
+// Called from mgc.html's oneditprepare alongside the existing menuManager
+// initialiser (logger/position dropdowns). Each module is responsible for
+// its own placeholder; we just kick them off in dependency order.
+
+(function () {
+  const ns = window.EVOLV?.nodes?.machineGroupControl;
+  if (!ns || !ns.editor) return;
+
+  ns.editor.initVisuals = function (node) {
+    if (ns.editor.modeCards && typeof ns.editor.modeCards.init === 'function') {
+      ns.editor.modeCards.init(node);
+    }
+    if (ns.editor.rendezvousToggle && typeof ns.editor.rendezvousToggle.init === 'function') {
+      ns.editor.rendezvousToggle.init(node);
+    }
+    if (ns.editor.compactFields && typeof ns.editor.compactFields.init === 'function') {
+      ns.editor.compactFields.init(node);
+    }
+  };
+})();

src/efficiency/groupEfficiency.js

@@ -0,0 +1,96 @@
+'use strict';
+
+// Aggregates per-machine efficiency (cog) into group-level metrics and
+// computes distance-from-peak. Extracted verbatim from specificClass.js
+// (calcGroupEfficiency / calcDistanceFromPeak / calcRelativeDistanceFromPeak /
+// calcDistanceBEP) so the orchestrator can delegate without inheriting
+// the arithmetic.
+
+class GroupEfficiency {
+    constructor(ctx = {}) {
+        this.ctx = ctx;
+        this.logger = ctx.logger || null;
+        this.interpolation = ctx.interpolation || null;
+        this.measurements = ctx.measurements || null;
+        this.machines = ctx.machines || null;
+    }
+
+    // Average of per-machine cog plus the worst-performing machine's cog.
+    // `maxEfficiency` is misleadingly named — it is in fact the MEAN cog
+    // across all machines, treated as the group-level "peak" target.
+    // Kept that way for behavioural parity with the original.
+    calcGroupEfficiency(machines) {
+        const target = machines || this.machines;
+        let cumEfficiency = 0;
+        let machineCount = 0;
+        let lowestEfficiency = Infinity;
+
+        Object.entries(target || {}).forEach(([_id, machine]) => {
+            cumEfficiency += machine.cog;
+            if (machine.cog < lowestEfficiency) {
+                lowestEfficiency = machine.cog;
+            }
+            machineCount++;
+        });
+
+        const maxEfficiency = cumEfficiency / machineCount;
+        const currentEfficiency = this._readCurrentEfficiency();
+
+        return { maxEfficiency, lowestEfficiency, currentEfficiency };
+    }
+
+    calcDistanceFromPeak(currentEfficiency, peakEfficiency) {
+        return Math.abs(currentEfficiency - peakEfficiency);
+    }
+
+    // Maps current efficiency onto [0..1] across [maxEfficiency..minEfficiency].
+    // Returns undefined for any case where the metric is meaningless:
+    //   - currentEfficiency missing
+    //   - the [max..min] band has collapsed (homogeneous pump group, OR float
+    //     noise so |max-min| < DEGENERATE_EPS).
+    // Consumers must treat undefined as "no data" and display accordingly,
+    // not as 0% / 100% — both readings would be misleading.
+    calcRelativeDistanceFromPeak(currentEfficiency, maxEfficiency, minEfficiency) {
+        const DEGENERATE_EPS = 1e-9; // η points are 0..1, so 1e-9 catches float noise.
+        if (currentEfficiency == null) return undefined;
+        if (!this.interpolation) return undefined;
+        if (!Number.isFinite(maxEfficiency) || !Number.isFinite(minEfficiency)) return undefined;
+        if (Math.abs(maxEfficiency - minEfficiency) < DEGENERATE_EPS) return undefined;
+        return this.interpolation.interpolate_lin_single_point(
+            currentEfficiency,
+            maxEfficiency,
+            minEfficiency,
+            0,
+            1,
+        );
+    }
+
+    // Returns both abs + rel; orchestrator decides whether to mirror onto
+    // its own this.absDistFromPeak / this.relDistFromPeak fields.
+    calcDistanceBEP(currentEfficiency, maxEfficiency, minEfficiency) {
+        const absDistFromPeak = this.calcDistanceFromPeak(currentEfficiency, maxEfficiency);
+        const relDistFromPeak = this.calcRelativeDistanceFromPeak(
+            currentEfficiency,
+            maxEfficiency,
+            minEfficiency,
+        );
+        return { absDistFromPeak, relDistFromPeak };
+    }
+
+    // Pull the latest measured efficiency from the container if one was
+    // provided. Optional convenience — orchestrator may read it directly.
+    _readCurrentEfficiency() {
+        if (!this.measurements) return null;
+        try {
+            return this.measurements
+                .type('efficiency')
+                .variant('predicted')
+                .position('atequipment')
+                .getCurrentValue();
+        } catch (_err) {
+            return null;
+        }
+    }
+}
+
+module.exports = GroupEfficiency;

src/groupOps/groupCurves.js

@@ -0,0 +1,27 @@
+// Group-scope read helpers for pump curves.
+//
+// Optimizers and totals evaluate each pump at the GROUP operating point
+// (set by GroupOperatingPoint.equalize), not the pump's individual sensor-
+// driven point. Each pump exposes a parallel "group*" predict object —
+// these helpers fall back to the individual predicts when the pump hasn't
+// been initialised for group operation yet (first tick after register).
+
+function groupFlow(machine /*, ctx */)  {
+    return machine.groupPredictFlow  ?? machine.predictFlow;
+}
+
+function groupPower(machine /*, ctx */) {
+    return machine.groupPredictPower ?? machine.predictPower;
+}
+
+function groupNCog(machine /*, ctx */)  {
+    return machine.groupPredictFlow ? (machine.groupNCog ?? 0) : (machine.NCog ?? 0);
+}
+
+function groupCalcPower(machine, flow /*, ctx */) {
+    return typeof machine.groupCalcPower === 'function'
+        ? machine.groupCalcPower(flow)
+        : machine.inputFlowCalcPower(flow);
+}
+
+module.exports = { groupFlow, groupPower, groupNCog, groupCalcPower };

src/groupOps/groupOperatingPoint.js

@@ -0,0 +1,100 @@
+const { POSITIONS } = require('generalFunctions');
+
+// Group-scope measurement read/write + header equalization.
+//
+// Pulled out of specificClass during the P4 refactor: the equalization
+// logic is the source of truth for the "one consistent header operating
+// point" that the optimizer and totals modules both depend on. Keeping it
+// in one place makes the order-of-operations explicit (read header, write
+// onto every machine's group-scope predicts).
+class GroupOperatingPoint {
+    constructor(ctx = {}) {
+        // ctx: { measurements, machines, unitPolicy, logger }
+        // Late-binding via getters in the orchestrator works too — but
+        // passing the live references avoids re-plumbing setters.
+        this.ctx = ctx;
+        // Last header differential pressure (Pa) computed by equalize().
+        // Consumers (optimizer, strategies) read this to convert raw
+        // flow/power to hydraulic efficiency η = (Q·ΔP)/P.
+        this.headerDiffPa = 0;
+    }
+
+    get measurements() { return this.ctx.measurements; }
+    get machines()     { return this.ctx.machines; }
+    get unitPolicy()   { return this.ctx.unitPolicy; }
+    get logger()       { return this.ctx.logger; }
+
+    readChild(machine, type, variant, position, unit = null) {
+        return machine?.measurements
+            ?.type(type)
+            ?.variant(variant)
+            ?.position(position)
+            ?.getCurrentValue(unit || undefined);
+    }
+
+    writeOwn(type, variant, position, value, unit = null, timestamp = Date.now()) {
+        if (!Number.isFinite(value)) return;
+        this.measurements
+            .type(type)
+            .variant(variant)
+            .position(position)
+            .value(value, timestamp, unit || undefined);
+    }
+
+    // Force every machine's predict-curve interpolators to use the same
+    // (header) differential pressure for MGC's optimization. See the
+    // original _equalizeOperatingPoint commentary in specificClass for
+    // the full rationale (header source order, fDimension fallback).
+    equalize() {
+        const machines = this.machines || {};
+        if (Object.keys(machines).length === 0) return;
+
+        const pressureUnit = this.unitPolicy.canonical.pressure;
+        const groupHeaderDown = this.measurements
+            .type('pressure').variant('measured').position(POSITIONS.DOWNSTREAM)
+            .getCurrentValue(pressureUnit);
+        const groupHeaderUp = this.measurements
+            .type('pressure').variant('measured').position(POSITIONS.UPSTREAM)
+            .getCurrentValue(pressureUnit);
+
+        const childDown = [];
+        const childUp = [];
+        Object.values(machines).forEach(machine => {
+            const d = this.readChild(machine, 'pressure', 'measured', POSITIONS.DOWNSTREAM, pressureUnit);
+            const u = this.readChild(machine, 'pressure', 'measured', POSITIONS.UPSTREAM, pressureUnit);
+            if (Number.isFinite(d) && d > 0) childDown.push(d);
+            if (Number.isFinite(u) && u > 0) childUp.push(u);
+        });
+
+        const downIsHeader = Number.isFinite(groupHeaderDown) && groupHeaderDown > 0;
+        const upIsHeader   = Number.isFinite(groupHeaderUp)   && groupHeaderUp   > 0;
+        const headerDownstream = downIsHeader ? groupHeaderDown : (childDown.length ? Math.max(...childDown) : 0);
+        const headerUpstream   = upIsHeader   ? groupHeaderUp   : (childUp.length   ? Math.min(...childUp)   : 0);
+
+        const headerDiff = headerDownstream - headerUpstream;
+        if (!Number.isFinite(headerDiff) || headerDiff <= 0) {
+            this.logger?.debug?.(`Skipping equalization: invalid header diff ${headerDiff} (down=${headerDownstream}, up=${headerUpstream})`);
+            return;
+        }
+        // Stash so downstream callers (optimizer, strategies) can compute
+        // hydraulic efficiency without re-reading every machine's pressure.
+        this.headerDiffPa = headerDiff;
+
+        this.logger?.debug?.(`Equalizing operating point: down=${headerDownstream}, up=${headerUpstream}, diff=${headerDiff}`);
+
+        Object.values(machines).forEach(machine => {
+            if (typeof machine.setGroupOperatingPoint === 'function') {
+                machine.setGroupOperatingPoint(headerDownstream, headerUpstream);
+            } else {
+                // Older rotatingMachine without the group API — direct
+                // fDimension write keeps demos working while submodules
+                // are rolled forward.
+                if (machine.predictFlow)  machine.predictFlow.fDimension  = headerDiff;
+                if (machine.predictPower) machine.predictPower.fDimension = headerDiff;
+                if (machine.predictCtrl)  machine.predictCtrl.fDimension  = headerDiff;
+            }
+        });
+    }
+}
+
+module.exports = GroupOperatingPoint;

src/groupcontrol.test.js

@@ -5,11 +5,13 @@ const Machine = require('../../rotatingMachine/src/specificClass');
 const Measurement = require('../../measurement/src/specificClass');
 const baseCurve = require('../../generalFunctions/datasets/assetData/curves/hidrostal-H05K-S03R.json');
 
-const CONTROL_MODES = ['optimalcontrol', 'prioritycontrol', 'prioritypercentagecontrol'];
+// prioritypercentagecontrol mode and per-instance scaling state were
+// removed when set.demand became unit-self-describing — see
+// commands/handlers.js (bare number = %, {value, unit} = absolute).
+const CONTROL_MODES = ['optimalcontrol', 'prioritycontrol'];
 const MODE_LABELS = {
   optimalcontrol: 'OPT',
   prioritycontrol: 'PRIO',
-  prioritypercentagecontrol: 'PERC'
 };
 
 const stateConfig = {
@@ -60,7 +62,6 @@ function createGroupConfig(name) {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name: `machinegroup-${name}` },
     functionality: { softwareType: 'machinegroup', role: 'groupcontroller' },
-    scaling: { current: 'normalized' },
     mode: { current: 'optimalcontrol' }
   };
 }
@@ -185,7 +186,9 @@ async function driveModeToFlow({ mg, pt, mode, pressure, targetFlow, priorityOrd
   await sleep(15);
 
   mg.setMode(mode);
-  mg.setScaling('normalized'); // required for prioritypercentagecontrol, works for others too
+  // setScaling is gone — handleInput now takes canonical m³/s directly. This
+  // legacy diagnostic still works in % terms by sweeping demand 0..100 and
+  // mapping each step to canonical before dispatch.
 
   const dynamic = mg.calcDynamicTotals();
   const span = Math.max(dynamic.flow.max - dynamic.flow.min, 1);
@@ -197,7 +200,10 @@ async function driveModeToFlow({ mg, pt, mode, pressure, targetFlow, priorityOrd
   let best = { demand, flow: 0, power: 0, efficiency: 0, error: Infinity };
 
   for (let attempt = 0; attempt < 4; attempt += 1) {
-    await mg.handleInput('parent', demand, Infinity, priorityOrder);
+    // demand is a percent (0..100); convert to canonical m³/s for the
+    // post-refactor handleInput signature.
+    const canonical = dynamic.flow.min + (demand / 100) * (dynamic.flow.max - dynamic.flow.min);
+    await mg.handleInput('parent', canonical, Infinity, priorityOrder);
     await sleep(30);
 
     const totals = captureTotals(mg);

src/io/output.js

@@ -0,0 +1,129 @@
+'use strict';
+
+// Output + status-badge composition for machineGroupControl. Kept off the
+// orchestrator so specificClass stays under the file-size budget. Both
+// functions take the live MGC instance and reach for the same public surface
+// the rest of the package already uses (measurements, dynamicTotals, mode).
+
+const { statusBadge, POSITIONS } = require('generalFunctions');
+
+function _outputUnitForType(unitPolicy, type) {
+    switch (String(type || '').toLowerCase()) {
+        case 'flow':        return unitPolicy.output.flow;
+        case 'power':       return unitPolicy.output.power;
+        case 'pressure':    return unitPolicy.output.pressure;
+        case 'temperature': return unitPolicy.output.temperature;
+        default:            return null;
+    }
+}
+
+function getOutput(mgc) {
+    const out = {};
+    const { measurements, unitPolicy, mode, scaling, absDistFromPeak, relDistFromPeak } = mgc;
+    measurements.getTypes().forEach(type => {
+        measurements.getVariants(type).forEach(variant => {
+            const unit = _outputUnitForType(unitPolicy, type);
+            const read = (pos) => measurements.type(type).variant(variant).position(pos).getCurrentValue(unit || undefined);
+            const dn = read(POSITIONS.DOWNSTREAM);
+            const at = read(POSITIONS.AT_EQUIPMENT);
+            const up = read(POSITIONS.UPSTREAM);
+            if (dn != null) out[`downstream_${variant}_${type}`] = dn;
+            if (up != null) out[`upstream_${variant}_${type}`] = up;
+            if (at != null) out[`atEquipment_${variant}_${type}`] = at;
+            if (dn != null && up != null) {
+                const diff = measurements.type(type).variant(variant)
+                    .difference({ from: POSITIONS.DOWNSTREAM, to: POSITIONS.UPSTREAM, unit });
+                if (diff?.value != null) out[`differential_${variant}_${type}`] = diff.value;
+            }
+        });
+    });
+    out.mode = mode;
+    out.scaling = scaling;
+    out.absDistFromPeak = absDistFromPeak;
+    out.relDistFromPeak = relDistFromPeak;
+
+    // System (header) differential pressure resolved by the last equalize.
+    // Dashboards use this to compute head = ΔP / (ρ · g) for Q-H plots
+    // and to scale the BEP indicators without re-reading every child.
+    // Emitted in canonical Pa and in the configured output unit (mbar
+    // by default) so the dashboard can pick whichever it prefers.
+    const headerDiffPa = mgc.operatingPoint?.headerDiffPa;
+    if (Number.isFinite(headerDiffPa) && headerDiffPa > 0) {
+        out.headerDiffPa = headerDiffPa;
+        const pUnit = unitPolicy.output.pressure;
+        // 1 mbar = 100 Pa. Only convert when we recognise mbar; otherwise
+        // leave the raw Pa to avoid a stale or silently wrong unit label.
+        if (pUnit === 'mbar') out.headerDiffMbar = headerDiffPa / 100;
+    }
+
+    // Group capacity + active-machine counts. Surfaced so dashboards can
+    // show the same numbers the status badge does without subscribing to
+    // every child node individually. Emitted in the output flow unit (m³/h)
+    // so the dashed capacity envelope lands on the SAME axis as the predicted-
+    // flow series — dynamicTotals is canonical m³/s, so convert here. (Both
+    // telemetry consumers — the Grafana flow panel and the FlowFuse fanout —
+    // assume m³/h; emitting raw m³/s made the capacity lines render as ~0.)
+    const fUnit = unitPolicy.output.flow;
+    const capMax = mgc.dynamicTotals?.flow?.max;
+    const capMin = mgc.dynamicTotals?.flow?.min;
+    out.flowCapacityMax = Number.isFinite(capMax)
+        ? unitPolicy.convert(capMax, 'm3/s', fUnit, 'MGC flow capacity max') : 0;
+    out.flowCapacityMin = Number.isFinite(capMin)
+        ? unitPolicy.convert(capMin, 'm3/s', fUnit, 'MGC flow capacity min') : 0;
+
+    // Operator demand resolved by the last dispatch. Surfaced so the dashboard
+    // can overlay "what was asked" against the achieved total flow:
+    //  - demandFlow: resolved flow setpoint (post-envelope-clamp) in the output
+    //    flow unit (m³/h), same scale as the total-flow series.
+    //  - demandPct:  that setpoint as 0..100 % of the live capacity envelope
+    //    (flow.min..flow.max), so a % demand entered by the operator round-trips
+    //    regardless of whether they asked in % or absolute flow.
+    // Omitted entirely before the first demand arrives (degraded state).
+    if (mgc._lastDemand) {
+        const clampedCanonical = mgc._lastDemand.clamped;
+        out.demandFlow = unitPolicy.convert(clampedCanonical, 'm3/s', fUnit, 'MGC demand setpoint');
+        const span = Number.isFinite(capMin) && Number.isFinite(capMax) ? capMax - capMin : 0;
+        out.demandPct = span > 0
+            ? Math.max(0, Math.min(100, ((clampedCanonical - capMin) / span) * 100))
+            : 0;
+    }
+
+    out.machineCount = Object.keys(mgc.machines || {}).length;
+    out.machineCountActive = Object.values(mgc.machines || {}).filter((m) => {
+        const s = m?.state?.getCurrentState?.();
+        const md = m?.currentMode;
+        return s && s !== 'off' && s !== 'maintenance' && md !== 'maintenance';
+    }).length;
+
+    // Group movement status: 'working' while any child is still ramping /
+    // sequencing toward its dispatched setpoint, 'ready' once all have settled.
+    // The dispatch gate holds non-urgent demand until 'ready'; surfacing it lets
+    // a dashboard show why a fresh setpoint hasn't been applied yet.
+    out.movementState = typeof mgc.getMovementState === 'function' ? mgc.getMovementState() : 'ready';
+    return out;
+}
+
+function getStatusBadge(mgc) {
+    const totalFlow = mgc.measurements.type('flow').variant('predicted').position(POSITIONS.AT_EQUIPMENT)
+        .getCurrentValue(mgc.unitPolicy.output.flow) ?? 0;
+    const totalPower = mgc.measurements.type('power').variant('predicted').position(POSITIONS.AT_EQUIPMENT)
+        .getCurrentValue(mgc.unitPolicy.output.power) ?? 0;
+    const totalCapacity = mgc.dynamicTotals?.flow?.max ?? 0;
+    const available = Object.values(mgc.machines).filter(m => {
+        const s = m?.state?.getCurrentState?.();
+        const md = m?.currentMode;
+        return s && s !== 'off' && s !== 'maintenance' && md !== 'maintenance';
+    });
+    const machineCount = Object.keys(mgc.machines || {}).length;
+    const scaling = String(mgc.scaling || '').toLowerCase() === 'absolute' ? 'abs' : 'norm';
+    const parts = [
+        mgc.mode || '?',
+        scaling,
+        `Q=${Math.round(totalFlow)}/${Math.round(totalCapacity)} m³/h`,
+        `P=${Math.round(totalPower)} kW`,
+        `${available.length}/${machineCount}x`,
+    ];
+    return statusBadge.compose(parts, { fill: available.length > 0 ? 'green' : (machineCount > 0 ? 'yellow' : 'grey'), shape: 'dot' });
+}
+
+module.exports = { getOutput, getStatusBadge };

src/movement/machineProfile.js

@@ -0,0 +1,90 @@
+'use strict';
+
+// Builds a plain-object snapshot of a registered child machine for the
+// movement planner. Pure read — no contract changes to the parent/child
+// registration handshake, no mutation of the child.
+
+function buildProfile(child) {
+    if (!child) throw new TypeError('buildProfile: child is required');
+
+    const id = child?.config?.general?.id ?? null;
+    const state = typeof child.state?.getCurrentState === 'function'
+        ? child.state.getCurrentState()
+        : null;
+    const position = typeof child.state?.getCurrentPosition === 'function'
+        ? child.state.getCurrentPosition()
+        : null;
+
+    const mm = child.state?.movementManager;
+    const minPosition = Number(mm?.minPosition);
+    const maxPosition = Number(mm?.maxPosition);
+    const velocityPctPerS = (() => {
+        if (typeof mm?.getNormalizedSpeed === 'function' && Number.isFinite(maxPosition) && Number.isFinite(minPosition)) {
+            return mm.getNormalizedSpeed() * (maxPosition - minPosition);
+        }
+        const s = Number(mm?.speed);
+        return Number.isFinite(s) ? s : 0;
+    })();
+
+    // Source of truth for ladder durations is the child state's config.time
+    // (state.js stores the merged stateConfig there). Older fallbacks
+    // (child.config.stateConfig, child.stateConfig) are kept for callers
+    // that pre-populate them, but rotatingMachine doesn't — it stores
+    // timings under state.config.time. Reading the wrong path is silent:
+    // every duration defaults to 0, the planner thinks startup is
+    // instantaneous, tStar collapses to the ramp time, and same-time
+    // landing breaks.
+    const t = child.state?.config?.time
+        ?? child.config?.stateConfig?.time
+        ?? child.stateConfig?.time
+        ?? {};
+    const timings = {
+        startingS:    Number(t.starting)    || 0,
+        warmingupS:   Number(t.warmingup)   || 0,
+        stoppingS:    Number(t.stopping)    || 0,
+        coolingdownS: Number(t.coolingdown) || 0,
+    };
+
+    const remainingTransitionS = typeof child.state?.stateManager?.getRemainingTransitionS === 'function'
+        ? child.state.stateManager.getRemainingTransitionS()
+        : null;
+
+    const flowAt = (pos, pressure) => {
+        if (typeof child.predictFlow?.evaluate === 'function') {
+            return child.predictFlow.evaluate(pos, pressure);
+        }
+        return null;
+    };
+
+    // Inverse curve: target flow (canonical m³/s, in the child's output unit
+    // since predictCtrl was built from the same curve units) → control %.
+    // Mirrors the conversion the pump performs in flowController on a
+    // `flowmovement` command (rotatingMachine/src/flow/flowController.js:52).
+    // Returns null when the child has no curve loaded so the scheduler can
+    // fall back gracefully.
+    const positionForFlow = (flow) => {
+        if (!Number.isFinite(flow)) return null;
+        if (typeof child.predictCtrl?.y !== 'function') return null;
+        try {
+            const v = child.predictCtrl.y(flow);
+            return Number.isFinite(v) ? v : null;
+        } catch (_) {
+            return null;
+        }
+    };
+
+    return {
+        id,
+        state,
+        position,
+        minPosition,
+        maxPosition,
+        velocityPctPerS,
+        timings,
+        remainingTransitionS,
+        flowAt,
+        positionForFlow,
+    };
+}
+
+module.exports = { buildProfile };

src/movement/moveTrajectory.js

@@ -0,0 +1,86 @@
+'use strict';
+
+// Per-machine time-parameterised plan. Pure: given a MachineProfile
+// snapshot and a target position, computes how long the move will take.
+//
+// Cases by profile.state:
+//   idle / off              startup ladder + ramp from min to target
+//   operational             |target − position| / velocity
+//   accelerating |
+//   decelerating            post-abort residue, same as operational
+//   starting                remaining-in-starting + full warmup + ramp from min
+//   warmingup               remaining-in-warmingup + ramp from min
+//   stopping | coolingdown  non-interruptible deload; cannot contribute flow
+//                           in this dispatch — returns null so the scheduler
+//                           can exclude the machine from "up" candidates.
+//
+// Velocity of 0 returns Infinity (misconfigured speed) so the scheduler
+// can demote the machine without crashing.
+
+const ACTIVE_OPERATIONAL = new Set(['operational', 'accelerating', 'decelerating']);
+const STARTUP_LADDER     = new Set(['starting', 'warmingup']);
+const SHUTDOWN_LADDER    = new Set(['stopping', 'coolingdown']);
+
+class MoveTrajectory {
+    constructor(profile, { targetPosition } = {}) {
+        if (!profile || typeof profile !== 'object') {
+            throw new TypeError('MoveTrajectory: profile is required');
+        }
+        if (!Number.isFinite(targetPosition)) {
+            throw new TypeError('MoveTrajectory: targetPosition must be a finite number');
+        }
+        this.profile = profile;
+        this.targetPosition = this._clampToBounds(targetPosition);
+    }
+
+    _clampToBounds(p) {
+        const { minPosition, maxPosition } = this.profile;
+        if (Number.isFinite(minPosition) && p < minPosition) return minPosition;
+        if (Number.isFinite(maxPosition) && p > maxPosition) return maxPosition;
+        return p;
+    }
+
+    // Seconds from "fire" until the machine is delivering flow at
+    // targetPosition. Null when the machine is in a non-contributing
+    // (shutting-down) state.
+    etaToTargetS() {
+        const p = this.profile;
+        const v = p.velocityPctPerS;
+        const target = this.targetPosition;
+
+        if (SHUTDOWN_LADDER.has(p.state)) return null;
+
+        if (!Number.isFinite(v) || v <= 0) return Infinity;
+
+        if (p.state === 'operational' || ACTIVE_OPERATIONAL.has(p.state)) {
+            const dist = Math.abs(target - p.position);
+            return dist / v;
+        }
+
+        if (p.state === 'warmingup') {
+            // Remaining warmup, then ramp from minPosition to target.
+            // Ramp starts from minPosition because the pump is not moving
+            // during warmup — position is held at min.
+            const remW = p.remainingTransitionS ?? p.timings.warmingupS;
+            const rampDist = Math.max(0, target - p.minPosition);
+            return remW + rampDist / v;
+        }
+
+        if (p.state === 'starting') {
+            // Remaining-in-starting + full warmup duration + ramp from min.
+            const remS = p.remainingTransitionS ?? p.timings.startingS;
+            const rampDist = Math.max(0, target - p.minPosition);
+            return remS + p.timings.warmingupS + rampDist / v;
+        }
+
+        // idle / off / emergencystop / maintenance / any non-active state
+        // not in the ladders: full startup sequence to operational, then ramp.
+        const rampDist = Math.max(0, target - p.minPosition);
+        return p.timings.startingS + p.timings.warmingupS + rampDist / v;
+    }
+}
+
+MoveTrajectory.SHUTDOWN_LADDER = SHUTDOWN_LADDER;
+MoveTrajectory.STARTUP_LADDER  = STARTUP_LADDER;
+
+module.exports = MoveTrajectory;

src/movement/movementExecutor.js

@@ -0,0 +1,121 @@
+'use strict';
+
+// Tick-driven executor for the schedule produced by movementScheduler.plan.
+//
+//  - Holds the current schedule + a cursor that advances one per tick().
+//  - Fires any unfired command whose fireAtTickN <= cursor.
+//  - replan(newSchedule) replaces the schedule and resets the cursor —
+//    already-fired commands stay fired (the pump's FSM is downstream and
+//    handles their consequences; the executor never tries to "undo" a
+//    fired startup, which keeps warmup/cooldown safety intact).
+//  - fireCommand is injected for unit-testability — production wires it to
+//    `machine.handleInput(...)`.
+
+class MovementExecutor {
+    constructor({ fireCommand, logger } = {}) {
+        if (typeof fireCommand !== 'function') {
+            throw new TypeError('MovementExecutor: fireCommand callback is required');
+        }
+        this._fireCommand = fireCommand;
+        this._logger = logger || null;
+        this._schedule = null;
+        this._cursor = 0;
+        this._firedIdx = new Set();
+        // Wall-clock anchor for the active schedule. Each tick recomputes
+        // a "virtual cursor" from elapsed time so the schedule survives a
+        // blocking first tick (e.g. an awaited startup sequence that takes
+        // multiple seconds to settle).
+        this._dispatchT0 = null;
+    }
+
+    // Replace the active schedule. Cursor starts at 0 (new dispatch is
+    // anchored to "now"). The previous schedule's unfired commands are
+    // dropped; already-fired commands are not retracted.
+    replan(schedule) {
+        this._schedule = schedule || { commands: [] };
+        this._cursor = 0;
+        this._firedIdx = new Set();
+        this._dispatchT0 = Date.now();
+        if (this._logger?.debug) {
+            const cmds = this._schedule.commands || [];
+            this._logger.debug(`MovementExecutor.replan: ${cmds.length} commands, tStar=${this._schedule.tStarS ?? '?'}s`);
+        }
+    }
+
+    // Advance one tick. Returns a Promise resolving to the list of
+    // commands fired this tick once their async work settles. Awaiting
+    // the FIRST tick from within a dispatch is what gives the new move
+    // priority over an in-flight shutdown sequence — fire-and-forget
+    // gives the shutdown's for-loop a window to progress through state
+    // transitions before the new move's residue handler claims the FSM.
+    async tick() {
+        // Virtual cursor = max(advanced cursor, elapsed wall-clock ticks).
+        // If a previous tick blocked on a long await, elapsed time has
+        // already passed and we should fire every command whose
+        // fireAtTickN now lies in the past — not wait another N timer
+        // cycles to catch up. tickS is stamped on the schedule by the
+        // planner (defaults to 1 s).
+        const tickS = Number.isFinite(this._schedule?.tickS) && this._schedule.tickS > 0
+            ? this._schedule.tickS
+            : 1;
+        const elapsedS = this._dispatchT0 != null ? (Date.now() - this._dispatchT0) / 1000 : 0;
+        const wallTick = Math.floor(elapsedS / tickS);
+        const virtCursor = Math.max(this._cursor, wallTick);
+
+        const fired = [];
+        const cmds = this._schedule?.commands || [];
+        for (let i = 0; i < cmds.length; i++) {
+            if (this._firedIdx.has(i)) continue;
+            const c = cmds[i];
+            if (c.fireAtTickN <= virtCursor) {
+                this._firedIdx.add(i);
+                try {
+                    // Fire-and-forget. The synchronous prologue of
+                    // handleInput claims the latest-wins gate before
+                    // returning its promise — that's enough for race
+                    // favouring. AWAITing the returned promise here
+                    // would block the executor for the entire ladder +
+                    // ramp duration of a flowmovement-after-startup
+                    // (because the pump's delayedMove only resolves
+                    // when the ramp completes), preventing the
+                    // wall-clock timer from starting and dragging every
+                    // delayed command in the schedule forward by that
+                    // amount.
+                    const r = this._fireCommand(c);
+                    if (r && typeof r.then === 'function') {
+                        r.catch((e) => {
+                            if (this._logger?.error) {
+                                this._logger.error(`MovementExecutor: fireCommand rejected for ${c.machineId}/${c.action}: ${e?.message || e}`);
+                            }
+                        });
+                    }
+                    fired.push(c);
+                } catch (e) {
+                    if (this._logger?.error) {
+                        this._logger.error(`MovementExecutor: fireCommand failed for ${c.machineId}/${c.action}: ${e?.message || e}`);
+                    }
+                }
+            }
+        }
+        this._cursor = virtCursor + 1;
+        return fired;
+    }
+
+    // Telemetry — number of commands not yet fired.
+    pending() {
+        const cmds = this._schedule?.commands || [];
+        return cmds.length - this._firedIdx.size;
+    }
+
+    // Telemetry — current tick cursor.
+    cursor() {
+        return this._cursor;
+    }
+
+    // Telemetry — the live schedule (read-only view).
+    schedule() {
+        return this._schedule;
+    }
+}
+
+module.exports = MovementExecutor;

src/movement/movementScheduler.js

@@ -0,0 +1,243 @@
+'use strict';
+
+// Pure movement planner. Given a set of machine profile snapshots and the
+// optimizer's chosen flow combination, returns a tick-indexed schedule of
+// commands that minimises flow disruption during the transition.
+//
+// Algorithm — rendezvous-on-demand-at-current-pressure:
+//
+//   1. For each machine, classify the move it needs (startup, flow-move
+//      up, flow-move down, shutdown, no-op) based on its current FSM state
+//      and the optimizer's target flow for it.
+//   2. Compute eta_i (seconds-to-target-flow) per machine via
+//      MoveTrajectory. Machines that can't contribute on this dispatch
+//      (stopping / coolingdown / unknown) are skipped.
+//   3. Rendezvous time t* = max(eta_i over ALL non-noop moves). The
+//      slowest move (typically a startup ladder + ramp) sets the deadline.
+//   4. Every command — including a startup's `execsequence` — is delayed by
+//      (t* − eta_j) so its move FINISHES at t*. A startup is delayed as a
+//      whole: its ladder begins at (t* − eta) and completes at (t* − rampS),
+//      then the queued flowmovement (held in the pump's delayedMove) ramps to
+//      finish at t*. The slowest mover (t* − eta == 0) fires immediately.
+//      Delaying the ladder — rather than firing it at tick 0 — is what keeps a
+//      faster-than-slowest startup from reaching `operational` early and
+//      sitting at its MINIMUM flow before t* (calcFlow at min position is not
+//      zero), which otherwise leaks ~min-flow into the group total ahead of
+//      the rendezvous (the staging bump).
+//
+//   Net effect: ALL pumps reach their per-pump flow target at the same
+//   wall-clock instant t*. Sum-of-flows is monotonic during the transition
+//   (no overshoot from a fast in-flight retarget arriving before the
+//   startup pumps catch up).
+//
+// The pump's flow→position conversion (via predictCtrl.y) lives in the
+// profile so this module is pure: no Node-RED calls, no live child reads.
+
+const MoveTrajectory = require('./moveTrajectory');
+
+const ACTIVE_STATES = new Set(['operational', 'accelerating', 'decelerating']);
+const STARTUP_LADDER = new Set(['starting', 'warmingup']);
+const SHUTDOWN_LADDER = new Set(['stopping', 'coolingdown']);
+
+// Tick cadence — MGC main loop is 1 Hz per .claude/rules tick convention.
+const DEFAULT_TICK_S = 1;
+
+function isOn(state) {
+    return ACTIVE_STATES.has(state) || STARTUP_LADDER.has(state);
+}
+
+// Classify the action a machine needs. The optimizer's combination is a
+// canonical statement of "what flow should this machine deliver now."
+// `targetFlow == 0` (or absence from combination) means "this machine is
+// not part of the new combination."
+function classify(profile, targetFlow) {
+    const isOff = !isOn(profile.state) && !SHUTDOWN_LADDER.has(profile.state);
+    if (targetFlow > 0) {
+        if (isOff) return 'startup';
+        return 'flowmove'; // up or down depending on current vs target
+    }
+    // targetFlow <= 0
+    if (ACTIVE_STATES.has(profile.state) || STARTUP_LADDER.has(profile.state)) {
+        return 'shutdown';
+    }
+    return 'noop';
+}
+
+// Direction in flow-space: increasing, decreasing, or unchanged. Drives
+// rendezvous: t* is the max eta over INCREASING moves; DECREASING moves
+// get delayed to land at t*.
+function directionOf(profile, targetFlow) {
+    if (!isOn(profile.state)) return targetFlow > 0 ? 'increasing' : 'unchanged';
+    const currentFlow = Number.isFinite(profile.flowAt?.(profile.position, profile._pressureForClassification))
+        ? profile.flowAt(profile.position, profile._pressureForClassification)
+        : null;
+    if (currentFlow == null) {
+        // Without a current-flow read, assume increasing iff target > 0.
+        return targetFlow > 0 ? 'increasing' : 'decreasing';
+    }
+    if (targetFlow > currentFlow) return 'increasing';
+    if (targetFlow < currentFlow) return 'decreasing';
+    return 'unchanged';
+}
+
+// Plan the schedule.
+//
+//   profiles        — array from buildProfile(child)
+//   combination     — array of {machineId, flow} from optimizer
+//   currentPressure — Pa, for flow→flow and flow→position conversions
+//   options         — { tickS?: 1, useRendezvous?: true }
+//
+//   useRendezvous=false collapses the schedule to "all commands fire at
+//   tick 0" — every pump moves at its own speed and lands at its own eta.
+//   Used when the operator explicitly opts out of same-time landing.
+function plan(profiles, combination, currentPressure, options = {}) {
+    const tickS = Number.isFinite(options.tickS) && options.tickS > 0 ? options.tickS : DEFAULT_TICK_S;
+    const useRendezvous = options.useRendezvous !== false;
+    const targets = new Map();
+    for (const item of combination || []) {
+        if (item && item.machineId != null) targets.set(String(item.machineId), Number(item.flow) || 0);
+    }
+
+    // First pass: classify + compute eta per machine.
+    const plans = [];
+    for (const p of profiles) {
+        const id = String(p.id);
+        const targetFlow = targets.get(id) ?? 0;
+
+        // Stash pressure on a copy of the profile so directionOf can read it
+        // without changing the public profile shape. Non-mutating: classify
+        // only needs the value during this pass.
+        const probeProfile = Object.assign({}, p, { _pressureForClassification: currentPressure });
+        const action = classify(p, targetFlow);
+        const direction = directionOf(probeProfile, targetFlow);
+
+        if (action === 'noop') {
+            plans.push({ machineId: id, action, direction, eta: 0, targetFlow, skip: true });
+            continue;
+        }
+
+        // Convert target flow to target position using the pump's inverse
+        // curve (lives on the profile). Fallback: linear interpolation
+        // across [min,max] using the curve domain we know.
+        let targetPosition = null;
+        if (action !== 'shutdown' && typeof p.positionForFlow === 'function') {
+            targetPosition = p.positionForFlow(targetFlow);
+        }
+        if (targetPosition == null) {
+            // Shutdown: target is the minimum position.
+            targetPosition = action === 'shutdown' ? (Number.isFinite(p.minPosition) ? p.minPosition : 0) : p.position;
+        }
+
+        let eta;
+        // Per-pump ladder duration; used to gate the flowmovement so it
+        // can't fire before warmup completes (the pump won't accept it).
+        const ladderS = action === 'startup'
+            ? ((Number(p.timings?.startingS) || 0) + (Number(p.timings?.warmingupS) || 0))
+            : 0;
+        // Ramp-only portion of the eta. For startup this is eta − ladder.
+        // For flow-move or shutdown the entire eta IS the ramp.
+        let rampS = 0;
+
+        if (action === 'shutdown') {
+            // Time for flow to reach zero = position ramp from current
+            // position to minPosition. stoppingS / coolingdownS happen
+            // AFTER flow is zero; they don't affect rendezvous.
+            const v = Number(p.velocityPctPerS) > 0 ? p.velocityPctPerS : Infinity;
+            const dist = Math.max(0, p.position - (p.minPosition ?? 0));
+            eta = v === Infinity ? 0 : dist / v;
+            rampS = eta;
+        } else {
+            const traj = new MoveTrajectory(p, { targetPosition });
+            eta = traj.etaToTargetS();
+            if (eta == null) eta = Infinity; // shouldn't happen for non-shutdown actions, but defensive
+            rampS = Math.max(0, Number.isFinite(eta) ? eta - ladderS : 0);
+        }
+
+        plans.push({ machineId: id, action, direction, eta, ladderS, rampS, targetFlow, targetPosition, skip: false });
+    }
+
+    // Rendezvous: t* = max eta over ALL non-noop moves. Includes
+    // increasing AND decreasing flow-moves so the slowest mover sets the
+    // deadline for everyone. When useRendezvous=false, tStar is forced
+    // to 0 so every command's delay collapses to 0 (legacy behaviour).
+    const allEtas = plans
+        .filter((q) => !q.skip && Number.isFinite(q.eta))
+        .map((q) => q.eta);
+    const tStar = useRendezvous && allEtas.length > 0 ? Math.max(...allEtas) : 0;
+
+    // Second pass: assign fireAtTickN. Every command is delayed so its
+    // move finishes at t*; the lone exception is the startup ladder's
+    // execsequence (the ladder must begin now because eta == ladder + ramp).
+    const commands = [];
+    for (const q of plans) {
+        if (q.skip) continue;
+
+        // Delay-to-rendezvous: fire (t* − eta) seconds from now so the
+        // move FINISHES at t*. Clamped to >= 0 (the eta == t* mover fires
+        // immediately).
+        const fireAtSDelayed = Math.max(0, tStar - q.eta);
+        const fireAtTickNDelayed = Math.round(fireAtSDelayed / tickS);
+        // Unchanged moves are no-ops; fire at 0 for simplicity (the pump
+        // ignores them and we don't pollute the schedule with delays).
+        const isUnchanged = q.direction === 'unchanged';
+
+        if (q.action === 'startup') {
+            // Just-in-time start. Delay the ENTIRE startup — ladder AND ramp —
+            // by (t* − eta), so the warmup ladder finishes (and the ramp
+            // begins) at (t* − rampS) and the flow lands exactly at t*.
+            //
+            // The ladder duration can't be compressed, but it CAN be delayed.
+            // Firing the execsequence at tick 0 (the old behaviour) made a
+            // faster-than-slowest startup reach `operational` early and sit at
+            // its minimum flow from warmup-end until its delayed ramp — leaking
+            // ~min-flow into the group total before t* (the staging bump). For
+            // the slowest pump (eta == t*) fireAtTickNDelayed is 0, so it still
+            // fires immediately. The flowmovement fires on the same tick; the
+            // pump holds it in delayedMove through the ladder, then ramps over
+            // rampS to finish at t*.
+            commands.push({
+                machineId: q.machineId,
+                action: 'execsequence',
+                sequence: 'startup',
+                fireAtTickN: fireAtTickNDelayed,
+                eta: q.eta,
+            });
+            commands.push({
+                machineId: q.machineId,
+                action: 'flowmovement',
+                flow: q.targetFlow,
+                fireAtTickN: fireAtTickNDelayed,
+                eta: q.eta,
+            });
+        } else if (q.action === 'flowmove') {
+            commands.push({
+                machineId: q.machineId,
+                action: 'flowmovement',
+                flow: q.targetFlow,
+                // Unchanged moves are no-ops; fire immediately so we
+                // don't park them behind a long startup ladder for no
+                // reason. Up/down moves both delay so they land at t*.
+                fireAtTickN: isUnchanged ? 0 : fireAtTickNDelayed,
+                eta: q.eta,
+            });
+        } else if (q.action === 'shutdown') {
+            commands.push({
+                machineId: q.machineId,
+                action: 'execsequence',
+                sequence: 'shutdown',
+                fireAtTickN: fireAtTickNDelayed,
+                eta: q.eta,
+            });
+        }
+    }
+
+    return {
+        tStarS: tStar,
+        tickS,
+        commands,
+        // Debugging telemetry — kept in the output so tests can introspect.
+        _plans: plans,
+    };
+}
+
+module.exports = { plan, DEFAULT_TICK_S };

src/nodeClass.js

@@ -1,280 +1,29 @@
-const { outputUtils, configManager, convert } = require("generalFunctions");
-const Specific = require("./specificClass");
+'use strict';
 
-class nodeClass {
-  /**
-   * Create a MeasurementNode.
-   * @param {object} uiConfig - Node-RED node configuration.
-   * @param {object} RED    - Node-RED runtime API.
-   * @param {object} nodeInstance - The Node-RED node instance.
-   * @param {string} nameOfNode - The name of the node, used for
-   */
-  constructor(uiConfig, RED, nodeInstance, nameOfNode) {
-    // Preserve RED reference for HTTP endpoints if needed
-    this.node = nodeInstance; // This is the Node-RED node instance, we can use this to send messages and update status
-    this.RED = RED; // This is the Node-RED runtime API, we can use this to create endpoints if needed
-    this.name = nameOfNode; // This is the name of the node, it should match the file name and the node type in Node-RED
-    this.source = null; // Will hold the specific class instance
+const { BaseNodeAdapter } = require('generalFunctions');
+const MachineGroup = require('./specificClass');
+const commands = require('./commands');
 
-    // Load default & UI config
-    this._loadConfig(uiConfig, this.node);
+// Event-driven: the domain emits 'output-changed' from handlePressureChange
+// (pump events) and from handleInput/turnOff. No tick loop needed.
+class nodeClass extends BaseNodeAdapter {
+  static DomainClass = MachineGroup;
+  static commands = commands;
+  static tickInterval = null;
+  static statusInterval = 1000;
 
-    // Instantiate core Measurement class
-    this._setupSpecificClass();
-
-    // Wire up event and lifecycle handlers
-    this._bindEvents();
-    this._registerChild();
-    this._startTickLoop();
-    this._attachInputHandler();
-    this._attachCloseHandler();
-  }
-
-  /**
-   * Load and merge default config with user-defined settings.
-   * @param {object} uiConfig - Raw config from Node-RED UI.
-   */
-  _loadConfig(uiConfig, node) {
-    const cfgMgr = new configManager();
-    this.defaultConfig = cfgMgr.getConfig(this.name);
-    const flowUnit = this._resolveUnitOrFallback(uiConfig.unit, 'volumeFlowRate', 'm3/h', 'flow');
-
-    // Build config: base sections (no domain-specific config for group controller)
-    this.config = cfgMgr.buildConfig(this.name, uiConfig, node.id);
-
-    // Utility for formatting outputs
-    this._output = new outputUtils();
-  }
-
-  _resolveUnitOrFallback(candidate, expectedMeasure, fallbackUnit, label) {
-    const raw = typeof candidate === "string" ? candidate.trim() : "";
-    const fallback = String(fallbackUnit || "").trim();
-    if (!raw) {
-      return fallback;
+  buildDomainConfig(uiConfig = {}) {
+    // Schema shape is mode.current / scaling.current (the schema nests
+    // value + allowedActions/allowedSources under `current`). Editor field
+    // names are flat — bridge here.
+    const out = {};
+    if (uiConfig.mode)    out.mode    = { current: uiConfig.mode };
+    if (uiConfig.scaling) out.scaling = { current: uiConfig.scaling };
+    if (uiConfig.useRendezvous !== undefined) {
+      out.planner = { useRendezvous: uiConfig.useRendezvous };
     }
-    try {
-      const desc = convert().describe(raw);
-      if (expectedMeasure && desc.measure !== expectedMeasure) {
-        throw new Error(`expected '${expectedMeasure}' but got '${desc.measure}'`);
-      }
-      return raw;
-    } catch (error) {
-      this.node?.warn?.(`Invalid ${label} unit '${raw}' (${error.message}). Falling back to '${fallback}'.`);
-      return fallback;
-    }
-  }
-
-  _updateNodeStatus() {
-    //console.log('Updating node status...');
-    const mg = this.source;
-    const mode = mg.mode;
-    const scaling = mg.scaling;
-
-    // Add safety checks for measurements
-    const totalFlow = mg.measurements
-      ?.type("flow")
-      ?.variant("predicted")
-      ?.position("atequipment")
-      ?.getCurrentValue(mg?.unitPolicy?.output?.flow || 'm3/h') || 0;
-
-    const totalPower = mg.measurements
-      ?.type("power")
-      ?.variant("predicted")
-      ?.position("atEquipment")
-      ?.getCurrentValue(mg?.unitPolicy?.output?.power || 'kW') || 0;
-
-    // Calculate total capacity based on available machines with safety checks
-    const availableMachines = Object.values(mg.machines || {}).filter((machine) => {
-      // Safety check: ensure machine and machine.state exist
-      if (!machine || !machine.state || typeof machine.state.getCurrentState !== 'function') {
-        mg.logger?.warn(`Machine missing or invalid: ${machine?.config?.general?.id || 'unknown'}`);
-        return false;
-      }
-
-      const state = machine.state.getCurrentState();
-      const mode = machine.currentMode;
-      return !(
-        state === "off" ||
-        state === "maintenance" ||
-        mode === "maintenance"
-      );
-    });
-
-    const totalCapacity = Math.round((mg.dynamicTotals?.flow?.max || 0) * 1) / 1;
-
-    // Determine overall status based on available machines
-    const status = availableMachines.length > 0
-      ? `${availableMachines.length} machine(s) connected`
-      : "No machines";
-
-    let scalingSymbol = "";
-    switch ((scaling || "").toLowerCase()) {
-      case "absolute":
-        scalingSymbol = "Ⓐ";
-        break;
-      case "normalized":
-        scalingSymbol = "Ⓝ";
-        break;
-      default:
-        scalingSymbol = mode || "";
-        break;
-    }
-
-    const text = ` ${mode || 'Unknown'} | ${scalingSymbol}: 💨=${Math.round(totalFlow)}/${totalCapacity} | ⚡=${Math.round(totalPower)} | ${status}`;
-
-    return {
-      fill: availableMachines.length > 0 ? "green" : "red",
-      shape: "dot",
-      text,
-    };
-  }
-
-  /**
-   * Instantiate the core logic and store as source.
-   */
-  _setupSpecificClass() {
-    this.source = new Specific(this.config);
-    this.node.source = this.source; // Store the source in the node instance for easy access
-  }
-
-  /**
-   * Bind events to Node-RED status updates. Using internal emitter. --> REMOVE LATER WE NEED ONLY COMPLETE CHILDS AND THEN CHECK FOR UPDATES
-   */
-  _bindEvents() {
-    this.source.emitter.on("mAbs", (val) => {
-      this.node.status({
-        fill: "green",
-        shape: "dot",
-        text: `${val} ${this.config.general.unit}`,
-      });
-    });
-  }
-
-  /**
-   * Register this node as a child upstream and downstream.
-   * Delayed to avoid Node-RED startup race conditions.
-   */
-  _registerChild() {
-    setTimeout(() => {
-      this.node.send([
-        null,
-        null,
-        {
-          topic: "registerChild",
-          payload: this.node.id,
-          positionVsParent:
-            this.config?.functionality?.positionVsParent || "atEquipment",
-        },
-      ]);
-    }, 100);
-  }
-
-  /**
-   * Start the periodic tick loop to drive the Measurement class.
-   */
-  _startTickLoop() {
-    setTimeout(() => {
-      this._tickInterval = setInterval(() => this._tick(), 1000);
-       // Update node status on nodered screen every second ( this is not the best way to do this, but it works for now)
-      this._statusInterval = setInterval(() => {
-        const status = this._updateNodeStatus();
-        this.node.status(status);
-      }, 1000);
-    }, 1000);
-  }
-
-  /**
-   * Execute a single tick: update measurement, format and send outputs.
-   */
-  _tick() {
-    const raw = this.source.getOutput();
-    const processMsg = this._output.formatMsg(raw, this.source.config, "process");
-    const influxMsg = this._output.formatMsg(raw, this.source.config, "influxdb");
-
-    // Send only updated outputs on ports 0 & 1
-    this.node.send([processMsg, influxMsg]);
-  }
-
-  /**
-   * Attach the node's input handler, routing control messages to the class.
-   */
-  _attachInputHandler() {
-    this.node.on(
-      "input",
-      async (msg, send, done) => {
-        const mg = this.source;
-        const RED = this.RED;
-        try {
-          switch (msg.topic) {
-            case "registerChild": {
-              const childId = msg.payload;
-              const childObj = RED.nodes.getNode(childId);
-              if (!childObj || !childObj.source) {
-                mg.logger.warn(`registerChild skipped: missing child/source for id=${childId}`);
-                break;
-              }
-
-              mg.logger.debug(`Registering child: ${childId}, found: ${!!childObj}, source: ${!!childObj?.source}`);
-
-              mg.childRegistrationUtils.registerChild(childObj.source, msg.positionVsParent);
-
-              mg.logger.debug(`Total machines after registration: ${Object.keys(mg.machines || {}).length}`);
-              break;
-            }
-
-            case "setMode": {
-              const mode = msg.payload;
-              mg.setMode(mode);
-              break;
-            }
-
-            case "setScaling": {
-              const scaling = msg.payload;
-              mg.setScaling(scaling);
-              break;
-            }
-
-            case "Qd": {
-              const Qd = parseFloat(msg.payload);
-              const sourceQd = "parent";
-              if (isNaN(Qd)) {
-                mg.logger.error(`Invalid demand value: ${msg.payload}`);
-                break;
-              }
-              try {
-                await mg.handleInput(sourceQd, Qd);
-                msg.topic = mg.config.general.name;
-                msg.payload = "done";
-                send(msg);
-              } catch (error) {
-                mg.logger.error(`Failed to process Qd: ${error.message}`);
-              }
-              break;
-            }
-
-            default:
-              mg.logger.warn(`Unknown topic: ${msg.topic}`);
-              break;
-          }
-        } catch (error) {
-          mg.logger.error(`Input handler failure: ${error.message}`);
-        }
-        if (typeof done === 'function') done();
-      }
-    );
-  }
-
-  /**
-   * Clean up timers and intervals when Node-RED stops the node.
-   */
-  _attachCloseHandler() {
-    this.node.on("close", (done) => {
-      clearInterval(this._tickInterval);
-      clearInterval(this._statusInterval);
-      this.node.status({});  // clear node status badge
-      if (typeof done === 'function') done();
-    });
+    return out;
   }
 }
 
-module.exports = nodeClass; // Export the class for Node-RED to use
+module.exports = nodeClass;

src/optimizer/bepGravitation.js

@@ -0,0 +1,188 @@
+// BEP-gravitation optimizer: bias flow allocation toward each pump's BEP,
+// then refine via marginal-cost swaps. `ctx` shape matches bestCombination.js.
+
+const MC_ITER_CAP = 50;        // marginal-cost refinement iterations
+const MC_RELATIVE_EXIT = 0.001; // exit when the mc gap is < 0.1% of expensive.mc
+
+// Estimate dP/dQ slopes around the BEP on the group operating point.
+// Returns finite numbers for everything; falls back to zero slopes if the
+// curve is flat or the machine has not been initialised.
+function estimateSlopesAtBEP(machine, Q_BEP, ctx, delta = 1.0) {
+    const { groupCurves } = ctx;
+    const { groupFlow, groupNCog, groupCalcPower } = groupCurves;
+
+    const minFlow = groupFlow(machine).currentFxyYMin;
+    const maxFlow = groupFlow(machine).currentFxyYMax;
+    const span = Math.max(0, maxFlow - minFlow);
+    const normalizedCog = Math.max(0, Math.min(1, groupNCog(machine) || 0));
+    const targetBEP = Q_BEP ?? (minFlow + span * normalizedCog);
+
+    const clampFlow = (flow) => Math.min(maxFlow, Math.max(minFlow, flow));
+    const center = clampFlow(targetBEP);
+    const deltaSafe = Math.max(delta, 0.01);
+    const leftFlow = clampFlow(center - deltaSafe);
+    const rightFlow = clampFlow(center + deltaSafe);
+
+    const powerAt = (flow) => groupCalcPower(machine, flow);
+    const P_center = powerAt(center);
+    const P_left = powerAt(leftFlow);
+    const P_right = powerAt(rightFlow);
+    const slopeLeft = (P_center - P_left) / Math.max(1e-6, center - leftFlow);
+    const slopeRight = (P_right - P_center) / Math.max(1e-6, rightFlow - center);
+    const alpha = Math.max(1e-6, (Math.abs(slopeLeft) + Math.abs(slopeRight)) / 2);
+
+    return { slopeLeft, slopeRight, alpha, Q_BEP: center, P_BEP: P_center };
+}
+
+// Redistribute `delta` across pumps using slope-derived weights; flatter
+// curves attract more flow. Bounded: exits on zero progress or no capacity.
+function redistributeFlowBySlope(pumpInfos, flowDistribution, delta, directional = true) {
+    const tolerance = 1e-3;
+    let remaining = delta;
+    const entryMap = new Map(flowDistribution.map(entry => [entry.machineId, entry]));
+
+    while (Math.abs(remaining) > tolerance) {
+        const increasing = remaining > 0;
+        const candidates = pumpInfos.map(info => {
+            const entry = entryMap.get(info.id);
+            if (!entry) return null;
+            const capacity = increasing ? info.maxFlow - entry.flow : entry.flow - info.minFlow;
+            if (capacity <= tolerance) return null;
+            const slope = increasing
+                ? (directional ? info.slopes.slopeRight : info.slopes.alpha)
+                : (directional ? info.slopes.slopeLeft : info.slopes.alpha);
+            const weight = 1 / Math.max(1e-6, Math.abs(slope) || info.slopes.alpha || 1);
+            return { entry, capacity, weight };
+        }).filter(Boolean);
+
+        if (!candidates.length) break;
+        const weightSum = candidates.reduce((sum, c) => sum + c.weight * c.capacity, 0);
+        if (weightSum <= 0) break;
+
+        let progress = 0;
+        candidates.forEach(candidate => {
+            let share = (candidate.weight * candidate.capacity / weightSum) * Math.abs(remaining);
+            share = Math.min(share, candidate.capacity);
+            if (share <= 0) return;
+            if (increasing) candidate.entry.flow += share;
+            else candidate.entry.flow -= share;
+            progress += share;
+        });
+
+        if (progress <= tolerance) break;
+        remaining += increasing ? -progress : progress;
+    }
+}
+
+function _marginalCostRefine(flowDistribution, pumpInfos, Qd, ctx) {
+    const { groupCalcPower } = ctx.groupCurves;
+    const mcDelta = Math.max(1e-6, (Qd / pumpInfos.length) * 0.005);
+
+    for (let iter = 0; iter < MC_ITER_CAP; iter++) {
+        const mcEntries = flowDistribution.map(entry => {
+            const info = pumpInfos.find(i => i.id === entry.machineId);
+            const pNow = groupCalcPower(info.machine, entry.flow);
+            const pUp = groupCalcPower(info.machine, Math.min(info.maxFlow, entry.flow + mcDelta));
+            return { entry, info, mc: (pUp - pNow) / mcDelta };
+        });
+
+        let expensive = null;
+        let cheap = null;
+        for (const e of mcEntries) {
+            if (e.entry.flow > e.info.minFlow + mcDelta && (!expensive || e.mc > expensive.mc)) expensive = e;
+            if (e.entry.flow < e.info.maxFlow - mcDelta && (!cheap || e.mc < cheap.mc)) cheap = e;
+        }
+        if (!expensive || !cheap || expensive === cheap) break;
+        if (expensive.mc - cheap.mc < expensive.mc * MC_RELATIVE_EXIT) break;
+
+        const before = groupCalcPower(expensive.info.machine, expensive.entry.flow)
+                     + groupCalcPower(cheap.info.machine, cheap.entry.flow);
+        const after = groupCalcPower(expensive.info.machine, expensive.entry.flow - mcDelta)
+                    + groupCalcPower(cheap.info.machine, cheap.entry.flow + mcDelta);
+        if (after < before) {
+            expensive.entry.flow -= mcDelta;
+            cheap.entry.flow += mcDelta;
+        } else {
+            break;
+        }
+    }
+}
+
+function calcBestCombinationBEPGravitation(combinations, Qd, ctx, method = 'BEP-Gravitation-Directional') {
+    const { machines, groupCurves } = ctx;
+    const { groupFlow, groupNCog, groupCalcPower } = groupCurves;
+    const directional = method === 'BEP-Gravitation-Directional';
+
+    let bestCombination = null;
+    let bestPower = Infinity;
+    let bestFlow = 0;
+    let bestCog = 0;
+    let bestDeviation = Infinity;
+
+    combinations.forEach(combination => {
+        const pumpInfos = combination.map(machineId => {
+            const machine = machines[machineId];
+            const minFlow = groupFlow(machine).currentFxyYMin;
+            const maxFlow = groupFlow(machine).currentFxyYMax;
+            const span = Math.max(0, maxFlow - minFlow);
+            const NCog = Math.max(0, Math.min(1, groupNCog(machine) || 0));
+            const estimatedBEP = minFlow + span * NCog;
+            const slopes = estimateSlopesAtBEP(machine, estimatedBEP, ctx);
+            return { id: machineId, machine, minFlow, maxFlow, NCog, Q_BEP: slopes.Q_BEP, slopes };
+        });
+
+        if (pumpInfos.length === 0) return;
+
+        const flowDistribution = pumpInfos.map(info => ({
+            machineId: info.id,
+            flow: Math.min(info.maxFlow, Math.max(info.minFlow, info.Q_BEP)),
+        }));
+
+        let totalFlow = flowDistribution.reduce((s, e) => s + e.flow, 0);
+        const delta = Qd - totalFlow;
+        if (Math.abs(delta) > 1e-6) {
+            redistributeFlowBySlope(pumpInfos, flowDistribution, delta, directional);
+        }
+
+        flowDistribution.forEach(entry => {
+            const info = pumpInfos.find(i => i.id === entry.machineId);
+            entry.flow = Math.min(info.maxFlow, Math.max(info.minFlow, entry.flow));
+        });
+
+        _marginalCostRefine(flowDistribution, pumpInfos, Qd, ctx);
+
+        let totalPower = 0;
+        totalFlow = 0;
+        flowDistribution.forEach(entry => {
+            totalFlow += entry.flow;
+            const info = pumpInfos.find(i => i.id === entry.machineId);
+            totalPower += groupCalcPower(info.machine, entry.flow);
+        });
+
+        const totalCog = pumpInfos.reduce((s, info) => s + info.NCog, 0);
+        const deviation = pumpInfos.reduce((sum, info) => {
+            const entry = flowDistribution.find(item => item.machineId === info.id);
+            const deltaFlow = entry ? (entry.flow - info.Q_BEP) : 0;
+            return sum + (deltaFlow * deltaFlow) * (info.slopes.alpha || 1);
+        }, 0);
+
+        const shouldUpdate = totalPower < bestPower
+            || (totalPower === bestPower && deviation < bestDeviation);
+
+        if (shouldUpdate) {
+            bestCombination = flowDistribution.map(e => ({ ...e }));
+            bestPower = totalPower;
+            bestFlow = totalFlow;
+            bestCog = totalCog;
+            bestDeviation = deviation;
+        }
+    });
+
+    return { bestCombination, bestPower, bestFlow, bestCog, bestDeviation, method };
+}
+
+module.exports = {
+    calcBestCombinationBEPGravitation,
+    estimateSlopesAtBEP,
+    redistributeFlowBySlope,
+};

src/optimizer/bestCombination.js

@@ -0,0 +1,88 @@
+// CoG-based combination optimizer.
+// Pure function: picks the combination whose CoG-weighted flow allocation
+// yields the lowest total power, clamped to each machine's curve envelope.
+//
+// `ctx` must provide:
+//   - machines: machineId -> machine
+//   - groupCurves: { groupFlow, groupNCog, groupCalcPower }
+//   - logger (optional, for debug traces)
+
+const ROUND_2 = 100;
+
+function calcBestCombination(combinations, Qd, ctx) {
+    const { machines, groupCurves, logger } = ctx;
+    const { groupFlow, groupNCog, groupCalcPower } = groupCurves;
+
+    let bestCombination = null;
+    let bestPower = Infinity;
+    let bestFlow = 0;
+    let bestCog = 0;
+
+    combinations.forEach(combination => {
+        const totalCoG = combination.reduce((sum, id) => {
+            return sum + Math.round((groupNCog(machines[id]) || 0) * ROUND_2) / ROUND_2;
+        }, 0);
+
+        // CoG-weighted initial distribution; if all CoGs are 0, split evenly.
+        let flowDistribution = combination.map(machineId => {
+            const machine = machines[machineId];
+            let flow;
+            if (totalCoG === 0) {
+                flow = Qd / combination.length;
+            } else {
+                flow = ((groupNCog(machine) || 0) / totalCoG) * Qd;
+                logger?.debug?.(`Machine Normalized CoG-based distribution ${machineId} flow: ${flow}`);
+            }
+            return { machineId, flow };
+        });
+
+        const clamped = flowDistribution.map(entry => {
+            const machine = machines[entry.machineId];
+            const min = groupFlow(machine).currentFxyYMin;
+            const max = groupFlow(machine).currentFxyYMax;
+            const clampedFlow = Math.min(max, Math.max(min, entry.flow));
+            return { ...entry, flow: clampedFlow, min, max, desired: entry.flow };
+        });
+
+        // Spill the unmet remainder once: distribute proportionally to each
+        // machine's *desired* share, weighted toward those with headroom.
+        let remainder = Qd - clamped.reduce((sum, entry) => sum + entry.flow, 0);
+        if (Math.abs(remainder) > 1e-6) {
+            const adjustable = clamped.filter(entry =>
+                remainder > 0 ? entry.flow < entry.max : entry.flow > entry.min,
+            );
+            const weightSum = adjustable.reduce((s, e) => s + e.desired, 0) || adjustable.length;
+
+            adjustable.forEach(entry => {
+                const weight = entry.desired / weightSum || 1 / adjustable.length;
+                const delta = remainder * weight;
+                const next = remainder > 0
+                    ? Math.min(entry.max, entry.flow + delta)
+                    : Math.max(entry.min, entry.flow + delta);
+                remainder -= (next - entry.flow);
+                entry.flow = next;
+            });
+        }
+
+        flowDistribution = clamped;
+
+        let totalFlow = 0;
+        let totalPower = 0;
+        flowDistribution.forEach(({ machineId, flow }) => {
+            totalFlow += flow;
+            totalPower += groupCalcPower(machines[machineId], flow);
+        });
+
+        if (totalPower < bestPower) {
+            logger?.debug?.(`New best combination found: ${totalPower} < ${bestPower}`);
+            bestPower = totalPower;
+            bestFlow = totalFlow;
+            bestCog = totalCoG;
+            bestCombination = flowDistribution;
+        }
+    });
+
+    return { bestCombination, bestPower, bestFlow, bestCog };
+}
+
+module.exports = { calcBestCombination };

src/optimizer/index.js

@@ -0,0 +1,17 @@
+const cog = require('./bestCombination');
+const bep = require('./bepGravitation');
+
+// Pick the optimizer module by config string.
+// Anything other than the two BEP variants falls back to CoG.
+function pickOptimizer(method) {
+    if (method === 'BEP-Gravitation' || method === 'BEP-Gravitation-Directional') return bep;
+    return cog;
+}
+
+module.exports = {
+    pickOptimizer,
+    calcBestCombination: cog.calcBestCombination,
+    calcBestCombinationBEPGravitation: bep.calcBestCombinationBEPGravitation,
+    estimateSlopesAtBEP: bep.estimateSlopesAtBEP,
+    redistributeFlowBySlope: bep.redistributeFlowBySlope,
+};

src/totals/totalsCalculator.js

@@ -0,0 +1,117 @@
+const { POSITIONS } = require('generalFunctions');
+const { groupFlow, groupPower, groupNCog } = require('../groupOps/groupCurves');
+
+// Aggregations across every machine in the group.
+//
+// calcAbsoluteTotals scans the full input-curve envelope (worst/best case
+// over the pump's entire pressure range). calcDynamicTotals reads the
+// current group operating point (after equalize). activeTotals only sums
+// machines that are operationally active right now.
+class TotalsCalculator {
+    constructor(ctx = {}) {
+        // ctx: { machines, unitPolicy, logger, operatingPoint, isMachineActive }
+        // operatingPoint is a GroupOperatingPoint instance (for readChild).
+        // isMachineActive is delegated back to the orchestrator so the
+        // state-machine vocabulary lives in one place.
+        this.ctx = ctx;
+        this.dynamicTotals  = { flow: { min: Infinity, max: 0 }, power: { min: Infinity, max: 0 }, NCog: 0 };
+        this.absoluteTotals = { flow: { min: Infinity, max: 0 }, power: { min: Infinity, max: 0 } };
+    }
+
+    get machines()         { return this.ctx.machines || {}; }
+    get unitPolicy()       { return this.ctx.unitPolicy; }
+    get logger()           { return this.ctx.logger; }
+    get operatingPoint()   { return this.ctx.operatingPoint; }
+
+    isMachineActive(id) {
+        if (typeof this.ctx.isMachineActive === 'function') return this.ctx.isMachineActive(id);
+        const s = this.machines[id]?.state?.getCurrentState?.();
+        return s === 'operational' || s === 'accelerating' || s === 'decelerating';
+    }
+
+    calcAbsoluteTotals() {
+        const out = { flow: { min: Infinity, max: 0 }, power: { min: Infinity, max: 0 } };
+
+        Object.values(this.machines).forEach(machine => {
+            const totals = { flow: { min: Infinity, max: 0 }, power: { min: Infinity, max: 0 } };
+            Object.entries(machine.predictFlow.inputCurve).forEach(([pressure, xyCurve]) => {
+                const minFlow  = Math.min(...xyCurve.y);
+                const maxFlow  = Math.max(...xyCurve.y);
+                const minPower = Math.min(...machine.predictPower.inputCurve[pressure].y);
+                const maxPower = Math.max(...machine.predictPower.inputCurve[pressure].y);
+                if (minFlow  < totals.flow.min)  totals.flow.min  = minFlow;
+                if (minPower < totals.power.min) totals.power.min = minPower;
+                if (maxFlow  > totals.flow.max)  totals.flow.max  = maxFlow;
+                if (maxPower > totals.power.max) totals.power.max = maxPower;
+            });
+            if (totals.flow.min  < out.flow.min)  out.flow.min  = totals.flow.min;
+            if (totals.power.min < out.power.min) out.power.min = totals.power.min;
+            out.flow.max  += totals.flow.max;
+            out.power.max += totals.power.max;
+        });
+
+        // Empty-group + sentinel reset: Infinity / -Infinity are math
+        // artefacts of the reducer's initial values; downstream code
+        // expects clean zeros.
+        if (out.flow.min  === Infinity)  { this.logger?.warn?.('Flow min Infinity — zeroing.');  out.flow.min  = 0; }
+        if (out.power.min === Infinity)  { this.logger?.warn?.('Power min Infinity — zeroing.'); out.power.min = 0; }
+        if (out.flow.max  === -Infinity) { this.logger?.warn?.('Flow max -Infinity — zeroing.');  out.flow.max  = 0; }
+        if (out.power.max === -Infinity) { this.logger?.warn?.('Power max -Infinity — zeroing.'); out.power.max = 0; }
+
+        this.absoluteTotals = out;
+        return out;
+    }
+
+    calcDynamicTotals() {
+        const out = { flow: { min: Infinity, max: 0, act: 0 }, power: { min: Infinity, max: 0, act: 0 }, NCog: 0 };
+        const fUnit = this.unitPolicy.canonical.flow;
+        const pUnit = this.unitPolicy.canonical.power;
+
+        Object.values(this.machines).forEach(machine => {
+            if (!machine.hasCurve) {
+                this.logger?.error?.(`Machine ${machine.config?.general?.id} has no valid curve — skipping.`);
+                return;
+            }
+            const gpf = groupFlow(machine);
+            const gpp = groupPower(machine);
+
+            const minFlow  = gpf.currentFxyYMin;
+            const maxFlow  = gpf.currentFxyYMax;
+            const minPower = gpp.currentFxyYMin;
+            const maxPower = gpp.currentFxyYMax;
+
+            const actFlow  = this.operatingPoint?.readChild(machine, 'flow',  'predicted', POSITIONS.DOWNSTREAM,   fUnit) || 0;
+            const actPower = this.operatingPoint?.readChild(machine, 'power', 'predicted', POSITIONS.AT_EQUIPMENT, pUnit) || 0;
+
+            if (minFlow  < out.flow.min)  out.flow.min  = minFlow;
+            if (minPower < out.power.min) out.power.min = minPower;
+            out.flow.max   += maxFlow;
+            out.power.max  += maxPower;
+            out.flow.act   += actFlow;
+            out.power.act  += actPower;
+            out.NCog       += groupNCog(machine);
+        });
+
+        this.dynamicTotals = out;
+        return out;
+    }
+
+    activeTotals() {
+        const out = { flow: { min: 0, max: 0 }, power: { min: 0, max: 0 }, countActiveMachines: 0 };
+
+        Object.entries(this.machines).forEach(([id, machine]) => {
+            if (!this.isMachineActive(id)) return;
+            const gpf = groupFlow(machine);
+            const gpp = groupPower(machine);
+            out.flow.min  += gpf.currentFxyYMin;
+            out.flow.max  += gpf.currentFxyYMax;
+            out.power.min += gpp.currentFxyYMin;
+            out.power.max += gpp.currentFxyYMax;
+            out.countActiveMachines += 1;
+        });
+
+        return out;
+    }
+}
+
+module.exports = TotalsCalculator;

test/_output-manifest.md

@@ -0,0 +1,180 @@
+# machineGroupControl — Output Manifest
+
+Per `.claude/rules/output-coverage.md`. Single source of truth for what MGC
+emits on Port 0/1/2, where the value comes from, and which test exercises it
+in populated AND degraded states.
+
+**Convention for missing values:** keys are **absent** when the underlying
+source has not produced a value yet (pre-first-tick, no demand, no pressure).
+Once produced, a key may be **explicitly null/undefined** only in the
+documented degenerate cases below. The dashboard formatter must treat both
+absent and null/undefined as "no data" (display `'—'`) — see the
+`pct`/`num` helpers in `examples/02-Dashboard.json :: fn_status_split`.
+
+---
+
+## Port 0 — process data
+
+Built by `src/io/output.js :: getOutput(mgc)`. Delta-compressed by
+`outputUtils.formatMsg(..., 'process')` — only changed keys appear in each emit.
+
+### Static fields (always emitted once MGC has been initialised)
+
+| Key | Source | Type / Range | Populated test | Degraded test |
+|---|---|---|---|---|
+| `mode` | `mgc.mode` (set via `set.mode` command; normalised by `specificClass.setMode`) | string ∈ {`optimalControl`, `priorityControl`, `maintenance`} (canonical camelCase) | commands.basic.test.js, ncog-distribution.integration.test.js | n/a — always set from constructor default |
+| `scaling` | `mgc.scaling` | string ∈ {`absolute`, `normalized`} or undefined | commands.basic.test.js | dashboard-fanout (undefined → raw-rows shows '—') |
+| `absDistFromPeak` | `groupEfficiency.calcDistanceFromPeak` (specificClass.js:132) | number ≥ 0 (η-points) | bep-distance-demand-sweep, group-bep-cascade, groupEfficiency.basic | groupEfficiency.basic test 7 (undefined when current = null) |
+| `relDistFromPeak` | `groupEfficiency.calcRelativeDistanceFromPeak` | number ∈ [0,1] **OR `undefined`** for degenerate (homogeneous pumps) | bep-distance-demand-sweep, group-bep-cascade | groupEfficiency.basic tests 5/6/7 (undefined cases), dashboard-fanout test 11 (undefined → '—' display) |
+| `flowCapacityMax` | `mgc.dynamicTotals.flow.max` (totalsCalculator), **converted to `unitPolicy.output.flow` (m³/h)** in output.js:62 | number m³/h ≥ 0; `0` when envelope unresolved (Infinity/NaN) | totalsCalculator.basic, dashboard-fanout (post-setup), demand-telemetry.basic | absent until first equalize; dashboard-fanout (state A); demand-telemetry (Infinity → 0) |
+| `flowCapacityMin` | `mgc.dynamicTotals.flow.min`, **converted to output flow unit (m³/h)** | number m³/h ≥ 0; `0` when unresolved | totalsCalculator.basic, demand-telemetry.basic | same as above |
+| `demandFlow` | `mgc._lastDemand.clamped` (set in `_runDispatch`, output.js:62) | number, canonical m³/s clamped to envelope, converted to `unitPolicy.output.flow` | demand-telemetry.basic (populated) | demand-telemetry.basic (absent before first demand); turnOff → 0 |
+| `demandPct` | derived `(clamped − flow.min)/(flow.max − flow.min)·100` (output.js:62) | number ∈ [0,100], `0` when capacity span ≤ 0 | demand-telemetry.basic (populated) | demand-telemetry.basic (absent before first demand) |
+| `machineCount` | `Object.keys(mgc.machines).length` | integer ≥ 0 | demand-cycle-walkthrough, ncog-distribution | n/a — always reflects current registration count |
+| `machineCountActive` | filtered count excluding `off`/`maintenance` states | integer ≥ 0 | demand-cycle-walkthrough, ncog-distribution | dashboard-fanout (state A: 0 active) |
+| `movementState` | `mgc.getMovementState()` (specificClass) — `'working'` while any child is ramping/sequencing or the executor has pending commands, else `'ready'` | string `'working'`\|`'ready'`, never null | movement-gate.basic (working: accelerating/warmingup/delayedMove/moveTimeLeft/executor-pending) | movement-gate.basic (ready: no machines, all settled) |
+
+### Conditional pressure-header fields (emitted only when equalize resolved a positive ΔP)
+
+| Key | Source | Type / Range | Populated test | Degraded test |
+|---|---|---|---|---|
+| `headerDiffPa` | `mgc.operatingPoint.headerDiffPa` (groupOperatingPoint.equalize) | number Pa > 0 | groupOperatingPoint.basic, dashboard-fanout (state B/C) | dashboard-fanout (state A — absent) |
+| `headerDiffMbar` | derived `headerDiffPa / 100` when `unitPolicy.output.pressure === 'mbar'` | number mbar > 0 | dashboard-fanout (state B/C) | absent when output pressure unit ≠ mbar — **not explicitly tested** |
+
+### Dynamic measurement fields — pattern `{position}_{variant}_{type}`
+
+Built by the loop at `io/output.js:23-39`. For each type×variant×position the
+container holds, one key is emitted **only if the value is non-null**.
+
+Positions: `downstream`, `upstream`, `atEquipment`. Plus `differential_<variant>_<type>` when both `downstream` and `upstream` exist.
+
+**Predicted measurements MGC writes itself (via writeOwn):**
+
+| Key | Source (write site) | Type / Range | Populated test | Degraded test |
+|---|---|---|---|---|
+| `atEquipment_predicted_flow` | `handlePressureChange` (specificClass:153), `_optimalControl` (specificClass:214), `equalFlowControl` (control/strategies:118), `turnOffAllMachines` (specificClass:297) | number, canonical m³/s converted to `unitPolicy.output.flow` | bep-distance-demand-sweep, dashboard-fanout (state B/C), ncog-distribution | dashboard-fanout (state A: absent), turnoff-deadlock (post-shutdown = 0) |
+| `downstream_predicted_flow` | `handlePressureChange` (specificClass:156 — mirrors AT_EQUIPMENT for PS contract), `turnOffAllMachines` (specificClass:296) | same as above | implicit in bep-distance-demand-sweep getOutput | turnoff-deadlock (post-shutdown = 0) |
+| `atEquipment_predicted_power` | same call sites as flow (specificClass:157, 213; strategies:117; specificClass:298) | number, canonical W converted to `unitPolicy.output.power` | bep-distance-demand-sweep, dashboard-fanout, distribution-power-table | turnoff-deadlock (= 0) |
+| `atEquipment_predicted_efficiency` | `_optimalControl` (specificClass:221), `equalFlowControl` (strategies:122) — only when `dP > 0 && bestPower > 0` | number ∈ [0, 1] hydraulic η = (Q·ΔP)/P | bep-distance-demand-sweep, dashboard-fanout (state C) | **absent** when dP ≤ 0 or bestPower ≤ 0 — guarded but not explicitly tested |
+| `atEquipment_predicted_Ncog` | `_optimalControl` (specificClass:224), `equalFlowControl` (strategies:125) | number, range **0..N where N = active pumps** (SUM of per-pump NCog from `bepGravitation.js:162` totalCog) — NOT 0..1; see [[project-mgc-bep-metrics-semantics]] | ncog-distribution (9 tests), bep-distance-demand-sweep, dashboard-fanout (state C) | dashboard-fanout normalizes by `machineCountActive` for display — tests 6/7/8/9/10 |
+
+**Measured pressures forwarded from children:**
+MGC subscribes to each registered measurement child (specificClass.js:91-104)
+and re-emits the child's reading on its own `MeasurementContainer`. If a
+pressure measurement child registers at position `downstream`, MGC will
+emit `downstream_measured_pressure` on Port 0 the next time `getOutput` runs.
+
+| Key pattern | Source | Tests |
+|---|---|---|
+| `<position>_measured_<type>` | child measurement node forwarded via `MeasurementContainer.emitter` (specificClass:91-105) | indirect — group-bep-cascade.integration drives pressure events through registered children; not asserted as a named output key |
+| `differential_measured_pressure` | computed when both `downstream_measured_pressure` and `upstream_measured_pressure` exist (output.js:33-37) | indirect via dashboard-fanout (used by fn_qh_point for header ΔP fallback) |
+
+---
+
+## Port 1 — InfluxDB telemetry
+
+Built by `outputUtils.formatMsg(..., 'influxdb')` — same `getOutput` source,
+different formatter. Emits the same key set as Port 0 with InfluxDB
+line-protocol tag/field discipline (cardinality rules per `.claude/rules/telemetry.md`).
+
+| Concern | Status |
+|---|---|
+| Keys | Identical to Port 0; the influxdb formatter (`generalFunctions/src/helper/formatters/influxdbFormatter.js`) decides which become tags vs fields. |
+| Test coverage | **None.** No test file imports/asserts the influxdb formatter for MGC. Regression vector if a key is added/renamed without checking cardinality. Tracked. |
+
+---
+
+## Port 2 — registration / control plumbing
+
+Emitted on startup by `BaseNodeAdapter` (one message per node).
+
+| Topic | Payload shape | Source | Tests |
+|---|---|---|---|
+| `registerChild` | `{ id: node.id, positionVsParent: <string> }` | BaseNodeAdapter init — sends to upstream parent so it can subscribe to this node's measurements | structure-examples.integration, commands.basic.test.js test 5 (`child.register`) — receiver side |
+
+---
+
+## Events emitted on `mgc.source.measurements.emitter`
+
+These are NOT Port 0/1/2 emissions — they're in-process events that downstream
+EVOLV nodes (e.g., pumpingStation) subscribe to via the parent-child handshake.
+Listed here for completeness; covered by `.claude/rules/telemetry.md` rather
+than this manifest.
+
+- `flow.predicted.atequipment` — fired on every `writeOwn` to flow/predicted/AT_EQUIPMENT
+- `flow.predicted.downstream` — fired on every `writeOwn` to flow/predicted/DOWNSTREAM (the live aggregate the PS subscribes to)
+- `power.predicted.atequipment`
+- `efficiency.predicted.atequipment`
+- `Ncog.predicted.atequipment`
+- `<type>.measured.<position>` — re-emit of any registered measurement child
+
+Documented in `CONTRACT.md`; tested indirectly via `group-bep-cascade.integration.test.js` and `ncog-distribution.integration.test.js`.
+
+---
+
+## Example flow fan-out — `examples/02-Dashboard.json :: fn_status_split` (outputs: 18)
+
+Delta-caches Port 0 then fans one msg per dashboard widget. Charts return the
+whole msg as `null` (drop the output) when their source is missing — never
+`{ payload: null }`. All ports covered by `test/integration/dashboard-fanout.integration.test.js`.
+
+| # | Target widget | Topic / payload | Populated | Degraded (missing source) |
+|---|---|---|---|---|
+| 0 | ui_txt_mode | string | ✔ State C | ✔ State A → mode string |
+| 1 | ui_txt_flow | `'… m³/h'` | ✔ | ✔ State A → `—` |
+| 2 | ui_txt_power | `'… kW'` | ✔ | ✔ → `—` |
+| 3 | ui_txt_capacity | `'min – max m³/h'` | ✔ State B | ✔ → `—` |
+| 4 | ui_txt_machines | `'nAct / nTot'` | ✔ | ✔ → `—` |
+| 5 | ui_txt_bep (rel%) | `'… %'` | ✔ | ✔ null/undefined → `—` |
+| 6 | ui_txt_eta | `'… %'` | ✔ | ✔ → `—` |
+| 7 | ui_txt_eta_peak | `'… %'` | ✔ | ✔ → `—` |
+| 8 | ui_txt_bep_abs | `'…'` (η pts, 3dp) | ✔ | ✔ → `—` |
+| 9 | ui_txt_ncog | `'… %'` (sum/nAct) | ✔ | ✔ nAct=0/missing → `—` |
+| 10 | ui_chart_flow | `{topic:'Flow', payload:number}` | ✔ | ✔ → null (drop) |
+| 11 | ui_chart_flow (capacity) | `{topic:'Capacity', …}` | ✔ | ✔ → null |
+| 12 | ui_chart_power | `{topic:'Power', …}` | ✔ | ✔ → null |
+| 13 | ui_chart_bep | `{topic:'BEP rel %', ×100}` | ✔ | ✔ → null |
+| 14 | ui_chart_eta | `{topic:'η (%)', ×100}` | ✔ | ✔ → null |
+| 15 | ui_tpl_raw | `[{key,value}]` rows | ✔ | ✔ |
+| 16 | ui_chart_qh (passthrough) | raw `msg.payload` | ✔ | ✔ |
+| 17 | ui_chart_mgc_pctcap | `{topic:'% of capacity', payload:flow/capMax×100}` | ✔ State C | ✔ State A → null (drop) |
+
+## Example flow fan-out — `examples/02-Dashboard.json :: fn_chart_pump_a/b/c` (outputs: 2 each)
+
+Each per-pump fan-out delta-caches the pump's Port 0 then emits two chart msgs.
+The ctrl output carries a **-1 OFF sentinel**: when the cached pump `state` is
+`off` / `idle` / `maintenance` the pump is not running, so it plots `-1` (below
+the 0–100 band) — a clear OFF rail distinct from a pump genuinely running at 0%.
+`ui_chart_pumps_ctrl` has `ymin: "-5"` so the sentinel is visible. Charts return
+the whole msg as `null` (drop the output) when their source is missing — never
+`{ payload: null }`. All ports covered by
+`test/integration/per-pump-ctrl-fanout.integration.test.js`.
+
+| # | Target chart | Topic / payload | Populated | Degraded |
+|---|---|---|---|---|
+| 0 | ui_chart_per_pump_flow | `{topic:'Pump A/B/C', payload:flow m³/h}` | ✔ running state | ✔ no `flow.predicted.downstream.*` key → null (drop) |
+| 1 | ui_chart_pumps_ctrl | `{topic:'Pump A/B/C', payload:ctrl%}`, or `payload:-1` when state ∈ {off,idle,maintenance} | ✔ running → +ctrl; ✔ off/idle/maintenance → -1 | ✔ no state + ctrl missing/NaN/null → null (drop); ✔ ctrl-only delta keeps cached OFF state |
+
+`fn_chart_total` (outputs: 1) feeds the same flow chart with the group total
+(`downstream_predicted_flow ?? atEquipment_predicted_flow`); returns `null` when
+both are absent.
+
+## Coverage gaps (open items)
+
+These are known holes flagged during the 2026-05-14 governance review; not yet
+fixed but documented so they don't regress silently.
+
+1. **Port 1 (InfluxDB) has no dedicated tests.** Any rename of a Port 0 key
+   should add an explicit Port 1 assertion to prevent silent cardinality
+   regressions.
+2. **`headerDiffMbar` only emitted when `unitPolicy.output.pressure === 'mbar'`.**
+   The fallback (non-mbar configurations) isn't explicitly tested.
+3. **`atEquipment_predicted_efficiency` absent-state isn't asserted.** The
+   `dP > 0 && bestPower > 0` guard exists but no test pins the absence.
+4. **Forwarded measured measurements** (`<position>_measured_<type>`) aren't
+   asserted as named output keys — only their underlying behaviour is exercised.
+5. **`scaling` undefined behaviour** — schema removed `scaling.current` for
+   several modes; what MGC emits for those is implicit, not tested.
+
+When any of these is closed, move the row up into the appropriate table and
+delete the entry here.

test/basic/bepGravitation.basic.test.js

@@ -0,0 +1,110 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const {
+    calcBestCombinationBEPGravitation,
+    estimateSlopesAtBEP,
+    redistributeFlowBySlope,
+} = require('../../src/optimizer/bepGravitation');
+const optimizerIndex = require('../../src/optimizer');
+
+function makeMachine({ id, fMin = 0, fMax = 100, NCog = 0.5, costFn } = {}) {
+    return {
+        config: { general: { id } },
+        NCog,
+        predictFlow: { currentFxyYMin: fMin, currentFxyYMax: fMax },
+        predictPower: { currentFxyYMin: 0, currentFxyYMax: fMax * 2 },
+        // Default: convex cost so marginal-cost refinement has a clear winner.
+        inputFlowCalcPower: costFn ?? ((f) => 0.001 * f * f + f),
+    };
+}
+
+function mkCtx(machines) {
+    return {
+        machines,
+        groupCurves: {
+            groupFlow: (m) => m.predictFlow,
+            groupPower: (m) => m.predictPower,
+            groupNCog: (m) => m.NCog ?? 0,
+            groupCalcPower: (m, f) => m.inputFlowCalcPower(f),
+        },
+        logger: { debug: () => {} },
+    };
+}
+
+test('estimateSlopesAtBEP: returns finite slopes/alpha/Q_BEP/P_BEP for a typical machine', () => {
+    const machine = makeMachine({ id: 'a', fMin: 10, fMax: 90, NCog: 0.5 });
+    const ctx = mkCtx({ a: machine });
+    const slopes = estimateSlopesAtBEP(machine, 50, ctx);
+    assert.ok(Number.isFinite(slopes.slopeLeft));
+    assert.ok(Number.isFinite(slopes.slopeRight));
+    assert.ok(Number.isFinite(slopes.alpha));
+    assert.ok(slopes.alpha > 0);
+    assert.ok(Number.isFinite(slopes.Q_BEP));
+    assert.equal(slopes.Q_BEP, 50);
+    assert.ok(Number.isFinite(slopes.P_BEP));
+});
+
+test('redistributeFlowBySlope: redistributes within capacity, never exceeding min/max', () => {
+    const pumpInfos = [
+        { id: 'a', minFlow: 0, maxFlow: 50,
+          slopes: { slopeLeft: 1, slopeRight: 1, alpha: 1 } },
+        { id: 'b', minFlow: 0, maxFlow: 50,
+          slopes: { slopeLeft: 1, slopeRight: 1, alpha: 1 } },
+    ];
+    const flowDist = [{ machineId: 'a', flow: 10 }, { machineId: 'b', flow: 10 }];
+    redistributeFlowBySlope(pumpInfos, flowDist, 30); // add 30 across 2 pumps
+    const total = flowDist.reduce((s, e) => s + e.flow, 0);
+    assert.ok(Math.abs(total - 50) < 1e-2, `expected total ~50, got ${total}`);
+    for (const e of flowDist) {
+        assert.ok(e.flow <= 50 + 1e-6 && e.flow >= 0 - 1e-6);
+    }
+});
+
+test('marginal-cost refinement bounded (no infinite loop on a flat-curve scenario)', () => {
+    // Flat cost everywhere -> marginal cost identical -> loop must exit cleanly.
+    const machines = {
+        a: makeMachine({ id: 'a', fMin: 0, fMax: 100, costFn: (f) => f }),
+        b: makeMachine({ id: 'b', fMin: 0, fMax: 100, costFn: (f) => f }),
+    };
+    const ctx = mkCtx(machines);
+    const start = Date.now();
+    const res = calcBestCombinationBEPGravitation([['a', 'b']], 30, ctx);
+    const elapsed = Date.now() - start;
+    assert.ok(elapsed < 1000, `refinement should be fast, took ${elapsed}ms`);
+    assert.ok(res.bestCombination);
+    const total = res.bestCombination.reduce((s, e) => s + e.flow, 0);
+    assert.ok(Math.abs(total - 30) < 1e-2, `total should be ~Qd, got ${total}`);
+});
+
+test('method selection: directional uses slopeRight/slopeLeft; non-directional uses alpha', () => {
+    // Asymmetric slopes so the two methods produce different allocations.
+    const pumpInfos = [
+        { id: 'a', minFlow: 0, maxFlow: 100,
+          slopes: { slopeLeft: 10, slopeRight: 0.1, alpha: 5 } },
+        { id: 'b', minFlow: 0, maxFlow: 100,
+          slopes: { slopeLeft: 0.1, slopeRight: 10, alpha: 5 } },
+    ];
+    const distDir = [{ machineId: 'a', flow: 10 }, { machineId: 'b', flow: 10 }];
+    const distAlpha = [{ machineId: 'a', flow: 10 }, { machineId: 'b', flow: 10 }];
+
+    // Increase by 30 -> directional should prefer 'a' (shallow right slope).
+    redistributeFlowBySlope(pumpInfos, distDir, 30, true);
+    // Alpha mode: same slope-weight per pump -> roughly equal split.
+    redistributeFlowBySlope(pumpInfos, distAlpha, 30, false);
+
+    const aDir = distDir.find(e => e.machineId === 'a').flow;
+    const bDir = distDir.find(e => e.machineId === 'b').flow;
+    const aAlpha = distAlpha.find(e => e.machineId === 'a').flow;
+    const bAlpha = distAlpha.find(e => e.machineId === 'b').flow;
+
+    assert.ok(aDir > bDir, `directional should send more to a (got a=${aDir}, b=${bDir})`);
+    assert.ok(Math.abs(aAlpha - bAlpha) < 1e-2, `alpha mode should split evenly (got a=${aAlpha}, b=${bAlpha})`);
+
+    // pickOptimizer wires the right module.
+    assert.equal(optimizerIndex.pickOptimizer('BEP-Gravitation-Directional').calcBestCombinationBEPGravitation,
+                 calcBestCombinationBEPGravitation);
+    assert.equal(optimizerIndex.pickOptimizer('BEP-Gravitation').calcBestCombinationBEPGravitation,
+                 calcBestCombinationBEPGravitation);
+    assert.ok(optimizerIndex.pickOptimizer('CoG').calcBestCombination);
+});

test/basic/bestCombination.basic.test.js

@@ -0,0 +1,67 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { calcBestCombination } = require('../../src/optimizer/bestCombination');
+
+function makeMachine({ id, fMin = 0, fMax = 100, NCog = 0.5, costFn } = {}) {
+    return {
+        config: { general: { id } },
+        NCog,
+        predictFlow: { currentFxyYMin: fMin, currentFxyYMax: fMax },
+        predictPower: { currentFxyYMin: 0, currentFxyYMax: fMax * 2 },
+        // Power model: caller picks the cost function so we can shape who wins.
+        inputFlowCalcPower: costFn ?? ((flow) => flow * 1.0),
+    };
+}
+
+function mkCtx(machines) {
+    return {
+        machines,
+        groupCurves: {
+            groupFlow: (m) => m.predictFlow,
+            groupPower: (m) => m.predictPower,
+            groupNCog: (m) => m.NCog ?? 0,
+            groupCalcPower: (m, f) => m.inputFlowCalcPower(f),
+        },
+        logger: { debug: () => {} },
+    };
+}
+
+test('calcBestCombination: 1 machine in combination receives Qd clamped to its range', () => {
+    const machines = { a: makeMachine({ id: 'a', fMin: 5, fMax: 60 }) };
+    const ctx = mkCtx(machines);
+
+    const res = calcBestCombination([['a']], 40, ctx);
+    assert.ok(res.bestCombination);
+    assert.equal(res.bestCombination.length, 1);
+    assert.equal(res.bestCombination[0].flow, 40);
+
+    // Above max — clamps to max.
+    const high = calcBestCombination([['a']], 200, ctx);
+    assert.equal(high.bestCombination[0].flow, 60);
+});
+
+test('calcBestCombination: 2 machines with equal NCog split flow evenly', () => {
+    const machines = {
+        a: makeMachine({ id: 'a', NCog: 0.5, fMin: 0, fMax: 100 }),
+        b: makeMachine({ id: 'b', NCog: 0.5, fMin: 0, fMax: 100 }),
+    };
+    const ctx = mkCtx(machines);
+    const res = calcBestCombination([['a', 'b']], 40, ctx);
+    const aFlow = res.bestCombination.find(e => e.machineId === 'a').flow;
+    const bFlow = res.bestCombination.find(e => e.machineId === 'b').flow;
+    assert.ok(Math.abs(aFlow - bFlow) < 1e-6, `expected even split, got a=${aFlow} b=${bFlow}`);
+    assert.ok(Math.abs(aFlow + bFlow - 40) < 1e-6);
+});
+
+test('calcBestCombination: returns combination with the lowest total power', () => {
+    // Two combinations: [a] (expensive) vs [b] (cheap). Both can deliver Qd=20.
+    const machines = {
+        a: makeMachine({ id: 'a', fMin: 0, fMax: 100, costFn: (f) => f * 10 }),
+        b: makeMachine({ id: 'b', fMin: 0, fMax: 100, costFn: (f) => f * 1 }),
+    };
+    const ctx = mkCtx(machines);
+    const res = calcBestCombination([['a'], ['b']], 20, ctx);
+    assert.equal(res.bestCombination[0].machineId, 'b');
+    assert.equal(res.bestPower, 20);
+});

test/basic/commands.basic.test.js

@@ -0,0 +1,358 @@
+// Basic tests for the machineGroupControl commands registry.
+// Run with:  node --test test/basic/commands.basic.test.js
+
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { createRegistry } = require('generalFunctions');
+const commands = require('../../src/commands');
+
+// --- helpers ---------------------------------------------------------------
+
+function makeLogger() {
+  const calls = { warn: [], error: [], info: [], debug: [] };
+  return {
+    calls,
+    warn: (m) => calls.warn.push(String(m)),
+    error: (m) => calls.error.push(String(m)),
+    info: (m) => calls.info.push(String(m)),
+    debug: (m) => calls.debug.push(String(m)),
+  };
+}
+
+function makeSource({
+  name = 'mgc-1',
+  handleInputResult = undefined,
+  dt = { flow: { min: 0, max: 100 } },
+  // Initial mode for the fake. Defaults to optimalControl so gates pass for
+  // the historical tests; per-test override via the returned `source.mode = …`.
+  mode = 'optimalControl',
+  // Override the gate decisions. Default-true matches the no-gating world
+  // tests assumed before this change; negative-path tests pass functions that
+  // return false for specific actions / sources.
+  isValidActionForMode = () => true,
+  isValidSourceForMode = () => true,
+} = {}) {
+  const calls = {
+    setMode: [],
+    handleInput: [],
+    registerChild: [],
+    turnOffAllMachines: 0,
+    gateAction: [],
+    gateSource: [],
+  };
+  const source = {
+    logger: makeLogger(),
+    config: { general: { name } },
+    mode,
+    setMode: (m) => { calls.setMode.push(m); /* keep fake.mode unchanged unless test does it */ },
+    isValidActionForMode: (action, m) => {
+      const ok = isValidActionForMode(action, m);
+      calls.gateAction.push({ action, mode: m, ok });
+      if (!ok) source.logger.warn(`action '${action}' not allowed in mode '${m}'`);
+      return ok;
+    },
+    isValidSourceForMode: (src, m) => {
+      const ok = isValidSourceForMode(src, m);
+      calls.gateSource.push({ src, mode: m, ok });
+      if (!ok) source.logger.warn(`source '${src}' not allowed in mode '${m}'`);
+      return ok;
+    },
+    handleInput: async (src, demand) => {
+      calls.handleInput.push({ src, demand });
+      if (handleInputResult instanceof Error) throw handleInputResult;
+      return handleInputResult;
+    },
+    // Mirror of the real specificClass.setDemand: resolves unit -> canonical
+    // m³/s and forwards to handleInput. With dt.flow {min:0,max:100} the %
+    // interpolation is identity, so a bare numeric demand round-trips through
+    // handleInput unchanged — keeping the existing assertions stable.
+    setDemand: async (value, unit = '%') => {
+      const v = Number(value);
+      if (!Number.isFinite(v)) return undefined;
+      if (v < 0) { await source.turnOffAllMachines(); return undefined; }
+      let canonical;
+      if (unit === '%') {
+        canonical = source.interpolation.interpolate_lin_single_point(
+          v, 0, 100, dt.flow.min, dt.flow.max);
+      } else {
+        const { convert } = require('generalFunctions');
+        canonical = convert(v).from(unit).to('m3/s');
+      }
+      return source.handleInput('parent', canonical);
+    },
+    // Retained for completeness — the mock setDemand uses these internally.
+    calcDynamicTotals: () => dt,
+    interpolation: {
+      interpolate_lin_single_point: (x, ix, iy, ox, oy) => {
+        if (iy === ix) return ox;
+        return ox + ((x - ix) * (oy - ox)) / (iy - ix);
+      },
+    },
+    turnOffAllMachines: async () => { calls.turnOffAllMachines += 1; },
+    childRegistrationUtils: {
+      registerChild: (childSource, position) =>
+        calls.registerChild.push({ childSource, position }),
+    },
+  };
+  return { source, calls };
+}
+
+function makeCtx({ child = null, logger = makeLogger(), sendSpy = null } = {}) {
+  return {
+    logger,
+    RED: { nodes: { getNode: (id) => (child && child.id === id ? child : undefined) } },
+    node: {},
+    send: sendSpy || (() => {}),
+  };
+}
+
+function makeRegistry(logger) {
+  return createRegistry(commands, { logger });
+}
+
+// --- tests -----------------------------------------------------------------
+
+test('canonical topics dispatch to their handlers', async () => {
+  const { source, calls } = makeSource();
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.mode', payload: 'prioritycontrol' }, source, makeCtx());
+  assert.deepEqual(calls.setMode, ['prioritycontrol']);
+
+  // bare-number demand → interpreted as % → interpolated against dt.flow.
+  // Default test dt is {min:0,max:100} so % is identity.
+  await reg.dispatch({ topic: 'set.demand', payload: '12.5' }, source, makeCtx());
+  assert.equal(calls.handleInput.length, 1);
+  assert.deepEqual(calls.handleInput[0], { src: 'parent', demand: 12.5 });
+});
+
+test('set.demand with explicit flow unit converts to canonical m³/s', async () => {
+  const { source, calls } = makeSource();
+  const reg = makeRegistry(makeLogger());
+  await reg.dispatch({ topic: 'set.demand', payload: { value: 200, unit: 'm3/h' } }, source, makeCtx());
+  assert.equal(calls.handleInput.length, 1);
+  // 200 m³/h = 0.0555... m³/s
+  assert.ok(Math.abs(calls.handleInput[0].demand - 0.05555555555555556) < 1e-9,
+    `expected ~0.0556 m³/s, got ${calls.handleInput[0].demand}`);
+});
+
+test('set.demand negative value triggers turnOffAllMachines and bypasses handleInput', async () => {
+  const { source, calls } = makeSource();
+  const reg = makeRegistry(makeLogger());
+  await reg.dispatch({ topic: 'set.demand', payload: -1 }, source, makeCtx());
+  assert.equal(calls.turnOffAllMachines, 1);
+  assert.equal(calls.handleInput.length, 0);
+});
+
+test('child.register canonical resolves child via RED.nodes.getNode', async () => {
+  const { source, calls } = makeSource();
+  const child = { id: 'child-1', source: { tag: 'child-domain' } };
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch(
+    { topic: 'child.register', payload: 'child-1', positionVsParent: 'upstream' },
+    source,
+    makeCtx({ child })
+  );
+  assert.equal(calls.registerChild.length, 1);
+  assert.equal(calls.registerChild[0].childSource, child.source);
+  assert.equal(calls.registerChild[0].position, 'upstream');
+});
+
+test('aliases dispatch to the same handler and log a one-time deprecation', async () => {
+  const { source, calls } = makeSource();
+  const ctxLogger = makeLogger();
+  const reg = makeRegistry(ctxLogger);
+
+  await reg.dispatch({ topic: 'setMode', payload: 'prioritycontrol' }, source, makeCtx({ logger: ctxLogger }));
+  await reg.dispatch({ topic: 'setMode', payload: 'optimalcontrol' }, source, makeCtx({ logger: ctxLogger }));
+  assert.deepEqual(calls.setMode, ['prioritycontrol', 'optimalcontrol']);
+  let warns = ctxLogger.calls.warn.filter((m) => m.includes("'setMode' is deprecated"));
+  assert.equal(warns.length, 1, 'setMode deprecation warning should log exactly once');
+
+  await reg.dispatch({ topic: 'Qd', payload: 5 }, source, makeCtx({ logger: ctxLogger }));
+  warns = ctxLogger.calls.warn.filter((m) => m.includes("'Qd' is deprecated"));
+  assert.equal(warns.length, 1);
+  assert.equal(calls.handleInput.length, 1);
+
+  const child = { id: 'child-x', source: { tag: 'child-domain' } };
+  await reg.dispatch(
+    { topic: 'registerChild', payload: 'child-x', positionVsParent: 'atEquipment' },
+    source,
+    makeCtx({ child, logger: ctxLogger })
+  );
+  warns = ctxLogger.calls.warn.filter((m) => m.includes("'registerChild' is deprecated"));
+  assert.equal(warns.length, 1);
+  assert.equal(calls.registerChild.length, 1);
+});
+
+test('set.demand with non-numeric payload logs error and does not call handleInput', async () => {
+  const { source, calls } = makeSource();
+  const ctxLogger = makeLogger();
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.demand', payload: 'oops' }, source, makeCtx({ logger: ctxLogger }));
+  assert.equal(calls.handleInput.length, 0);
+  assert.ok(
+    ctxLogger.calls.error.some((m) => m.includes('set.demand') && m.includes('oops')),
+    `expected error about invalid Qd, got: ${JSON.stringify(ctxLogger.calls.error)}`
+  );
+});
+
+test('set.demand on success calls ctx.send with reply { topic: config.general.name, payload: "done" }', async () => {
+  const { source, calls } = makeSource({ name: 'mgc-A' });
+  const sent = [];
+  const ctx = makeCtx({ sendSpy: (m) => sent.push(m) });
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.demand', payload: 7.5 }, source, ctx);
+
+  assert.equal(calls.handleInput.length, 1);
+  assert.deepEqual(calls.handleInput[0], { src: 'parent', demand: 7.5 });
+  assert.equal(sent.length, 1);
+  assert.equal(sent[0].topic, 'mgc-A');
+  assert.equal(sent[0].payload, 'done');
+});
+
+test('child.register with unknown child id logs warn and does not throw', async () => {
+  const { source, calls } = makeSource();
+  const ctxLogger = makeLogger();
+  const reg = makeRegistry(makeLogger());
+
+  await assert.doesNotReject(() =>
+    reg.dispatch(
+      { topic: 'child.register', payload: 'missing-id', positionVsParent: 'atEquipment' },
+      source,
+      makeCtx({ logger: ctxLogger })
+    )
+  );
+  assert.equal(calls.registerChild.length, 0);
+  assert.ok(
+    ctxLogger.calls.warn.some((m) => m.includes('registerChild') && m.includes('missing-id')),
+    `expected warn about missing child, got: ${JSON.stringify(ctxLogger.calls.warn)}`
+  );
+});
+
+// --- mode gate tests -------------------------------------------------------
+
+test('gate: set.demand in maintenance mode is dropped (action not allowed)', async () => {
+  // Mirror schema: maintenance allows only statusCheck. The dispatch action
+  // for a positive demand under optimalControl/priorityControl is
+  // execOptimalCombination / execSequentialControl — neither in maintenance.
+  const { source, calls } = makeSource({
+    mode: 'maintenance',
+    isValidActionForMode: (action) => action === 'statusCheck',
+  });
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.demand', payload: 50 }, source, makeCtx());
+  assert.equal(calls.handleInput.length, 0, 'handleInput must not be invoked');
+  assert.equal(calls.turnOffAllMachines, 0, 'turnOffAllMachines must not be invoked');
+  assert.ok(
+    source.logger.calls.warn.some((m) => m.includes('not allowed')),
+    `expected warn about action not allowed in maintenance, got: ${JSON.stringify(source.logger.calls.warn)}`
+  );
+});
+
+test("gate: set.demand from msg.source 'physical' in maintenance is dropped (source not allowed)", async () => {
+  // Maintenance accepts sources ['parent','GUI'] per schema. Physical/HMI is
+  // rejected by the source gate even before we ask which action to perform.
+  const { source, calls } = makeSource({
+    mode: 'maintenance',
+    isValidActionForMode: () => true, // pretend action is allowed; source gate must still reject
+    isValidSourceForMode: (src) => src === 'parent' || src === 'GUI',
+  });
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.demand', payload: 50, source: 'physical' }, source, makeCtx());
+  assert.equal(calls.handleInput.length, 0);
+  assert.equal(calls.turnOffAllMachines, 0);
+  assert.ok(
+    source.logger.calls.warn.some((m) => m.includes("'physical'") && m.includes('not allowed')),
+    `expected warn about physical source not allowed, got: ${JSON.stringify(source.logger.calls.warn)}`
+  );
+});
+
+test('gate: set.demand from msg.source GUI in optimalControl reaches handleInput', async () => {
+  const { source, calls } = makeSource({
+    mode: 'optimalControl',
+    isValidActionForMode: (action) =>
+      ['statusCheck', 'execOptimalCombination', 'balanceLoad', 'emergencyStop'].includes(action),
+    isValidSourceForMode: (src) => ['parent', 'GUI', 'physical', 'API'].includes(src),
+  });
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.demand', payload: 25, source: 'GUI' }, source, makeCtx());
+  assert.equal(calls.handleInput.length, 1);
+  assert.deepEqual(calls.handleInput[0], { src: 'parent', demand: 25 });
+  // Sanity check on the gate plumbing: both gates were consulted with the
+  // expected (action, source, mode) tuple.
+  assert.ok(calls.gateAction.some((g) => g.action === 'execOptimalCombination' && g.mode === 'optimalControl' && g.ok));
+  assert.ok(calls.gateSource.some((g) => g.src === 'GUI' && g.mode === 'optimalControl' && g.ok));
+});
+
+test('gate: emergencyStop (negative demand) gated by mode → maintenance blocks the stop-all', async () => {
+  // A negative demand is the operator stop-all signal. The schema declares
+  // emergencyStop in optimalControl/priorityControl but NOT in maintenance,
+  // so this should be rejected too — maintenance is "monitor only", which
+  // includes "no dispatch decisions, even shutdowns".
+  const { source, calls } = makeSource({
+    mode: 'maintenance',
+    isValidActionForMode: (action) => action === 'statusCheck',
+  });
+  const reg = makeRegistry(makeLogger());
+
+  await reg.dispatch({ topic: 'set.demand', payload: -1 }, source, makeCtx());
+  assert.equal(calls.turnOffAllMachines, 0, 'turnOff must be gated');
+  assert.ok(
+    source.logger.calls.warn.some((m) => m.includes('emergencyStop') && m.includes('not allowed')),
+    `expected warn about emergencyStop not allowed, got: ${JSON.stringify(source.logger.calls.warn)}`
+  );
+});
+
+// --- mode-string normalisation (specificClass internals) --------------------
+
+const { _normaliseMode, ALLOWED_MODES } = require('../../src/specificClass');
+
+test('mode normalisation: camelCase pass-through, lowercase accepted, garbage rejected', () => {
+  assert.equal(_normaliseMode('optimalControl'), 'optimalControl');
+  assert.equal(_normaliseMode('optimalcontrol'), 'optimalControl');
+  assert.equal(_normaliseMode('OPTIMALCONTROL'), 'optimalControl');
+  assert.equal(_normaliseMode('priorityControl'), 'priorityControl');
+  assert.equal(_normaliseMode('prioritycontrol'), 'priorityControl');
+  assert.equal(_normaliseMode('maintenance'), 'maintenance');
+  assert.equal(_normaliseMode('MAINTENANCE'), 'maintenance');
+  assert.equal(_normaliseMode('wat'), null);
+  assert.equal(_normaliseMode(''), null);
+  assert.equal(_normaliseMode(null), null);
+  assert.equal(_normaliseMode(undefined), null);
+  assert.deepEqual(ALLOWED_MODES, ['optimalControl', 'priorityControl', 'maintenance']);
+});
+
+// --- schema-shape regression -----------------------------------------------
+
+test('schema regression: allowedSources keys are camelCase for all three modes', () => {
+  // Read the JSON directly — generalFunctions' package.json `exports` map
+  // doesn't expose the configs subpath, and we don't want to add it just for
+  // a test. Path is repo-relative from this test file.
+  const fs = require('node:fs');
+  const path = require('node:path');
+  const schemaPath = path.resolve(__dirname, '../../../generalFunctions/src/configs/machineGroupControl.json');
+  const schema = JSON.parse(fs.readFileSync(schemaPath, 'utf8'));
+  const allowedSourcesSchema = schema.mode.allowedSources.rules.schema;
+  assert.ok(allowedSourcesSchema.optimalControl, 'optimalControl key must exist on allowedSources');
+  assert.ok(allowedSourcesSchema.priorityControl, 'priorityControl key must exist on allowedSources');
+  assert.ok(allowedSourcesSchema.maintenance, 'maintenance key must exist on allowedSources');
+  // Maintenance is monitor-only: parent + GUI permitted, physical/API rejected.
+  const mDefaults = allowedSourcesSchema.maintenance.default;
+  assert.ok(mDefaults.includes('parent'), `maintenance default should permit parent, got ${mDefaults}`);
+  assert.ok(mDefaults.includes('GUI'), `maintenance default should permit GUI, got ${mDefaults}`);
+  assert.ok(!mDefaults.includes('physical'), 'maintenance must NOT permit physical writes');
+  assert.ok(!mDefaults.includes('API'), 'maintenance must NOT permit API writes');
+  // Catch a regression to lowercase keys.
+  assert.equal(allowedSourcesSchema.optimalcontrol, undefined, 'lowercase optimalcontrol key must NOT exist');
+  assert.equal(allowedSourcesSchema.prioritycontrol, undefined, 'lowercase prioritycontrol key must NOT exist');
+});

test/basic/demand-telemetry.basic.test.js

@@ -0,0 +1,83 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { getOutput } = require('../../src/io/output.js');
+const MachineGroup = require('../../src/specificClass.js');
+
+// Real declared unit policy so the m³/s → m³/h conversion is the production one.
+const unitPolicy = MachineGroup.unitPolicy;
+
+// Minimal MGC stand-in exposing exactly the surface getOutput reads. The
+// measurement loop is short-circuited with an empty type list so the test
+// isolates the demand telemetry without needing curves / CoolProp.
+function mockMgc(overrides = {}) {
+  return {
+    measurements: { getTypes: () => [] },
+    unitPolicy,
+    mode: 'optimalControl',
+    scaling: 'absolute',
+    absDistFromPeak: 0,
+    relDistFromPeak: 0,
+    dynamicTotals: { flow: { min: 0.05, max: 0.25 } }, // m³/s
+    machines: {},
+    operatingPoint: {},
+    _lastDemand: null,
+    ...overrides,
+  };
+}
+
+test('demandFlow + demandPct emitted once a demand is resolved', () => {
+  // Demand resolved to 0.15 m³/s inside a 0.05..0.25 envelope → midpoint = 50%.
+  const out = getOutput(mockMgc({ _lastDemand: { canonical: 0.15, clamped: 0.15 } }));
+
+  // m³/s → m³/h is ×3600. 0.15 m³/s = 540 m³/h.
+  assert.equal(out.demandFlow, 540);
+  assert.ok(Math.abs(out.demandPct - 50) < 1e-9, `expected ~50%, got ${out.demandPct}`);
+});
+
+test('demandPct reflects the clamped setpoint, not the raw request', () => {
+  // Operator asked for 0.40 m³/s but the envelope caps at 0.25 → 100%.
+  const out = getOutput(mockMgc({ _lastDemand: { canonical: 0.40, clamped: 0.25 } }));
+  assert.equal(out.demandFlow, 900); // 0.25 m³/s = 900 m³/h
+  assert.equal(out.demandPct, 100);
+});
+
+test('demandPct is 0 (never NaN) when the capacity span is zero', () => {
+  const out = getOutput(mockMgc({
+    dynamicTotals: { flow: { min: 0.1, max: 0.1 } },
+    _lastDemand: { canonical: 0.1, clamped: 0.1 },
+  }));
+  assert.equal(out.demandPct, 0);
+  assert.ok(Number.isFinite(out.demandFlow));
+});
+
+test('turnOff demand (0) emits a zero setpoint, not absent', () => {
+  const out = getOutput(mockMgc({ _lastDemand: { canonical: 0, clamped: 0 } }));
+  assert.equal(out.demandFlow, 0);
+  assert.equal(out.demandPct, 0);
+});
+
+test('demand telemetry is absent before the first demand (degraded state)', () => {
+  const out = getOutput(mockMgc({ _lastDemand: null }));
+  assert.ok(!('demandFlow' in out), 'demandFlow must be absent pre-first-demand');
+  assert.ok(!('demandPct' in out), 'demandPct must be absent pre-first-demand');
+  // The always-on capacity fields are still present, converted to the output
+  // flow unit (m³/h): 0.05 m³/s → 180, 0.25 m³/s → 900.
+  assert.equal(out.flowCapacityMin, 180);
+  assert.equal(out.flowCapacityMax, 900);
+});
+
+test('flow capacity is emitted in the output unit (m³/h), matching the flow series', () => {
+  const out = getOutput(mockMgc({ dynamicTotals: { flow: { min: 0.1, max: 0.3 } } }));
+  assert.equal(out.flowCapacityMin, 360);  // 0.1 m³/s × 3600
+  assert.equal(out.flowCapacityMax, 1080); // 0.3 m³/s × 3600
+});
+
+test('flow capacity falls back to 0 when the envelope is unresolved (Infinity)', () => {
+  // Pre-first-equalize: dynamicTotals seeds min=Infinity, max=0.
+  const out = getOutput(mockMgc({ dynamicTotals: { flow: { min: Infinity, max: 0 } } }));
+  assert.equal(out.flowCapacityMin, 0);
+  assert.equal(out.flowCapacityMax, 0);
+});

test/basic/demandDispatcher.basic.test.js

@@ -0,0 +1,140 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DemandDispatcher = require('../../src/dispatch/demandDispatcher.js');
+
+const silentLogger = { warn() {}, error() {}, debug() {}, info() {} };
+
+// Helper: a manually-resolvable promise so we can pin a dispatch in flight.
+function deferred() {
+    let resolve;
+    let reject;
+    const promise = new Promise((res, rej) => { resolve = res; reject = rej; });
+    return { promise, resolve, reject };
+}
+
+test('fire(50) triggers runFn with 50', async () => {
+    const calls = [];
+    const dispatcher = new DemandDispatcher(
+        { logger: silentLogger },
+        async (demand) => { calls.push(demand); },
+    );
+    dispatcher.fire(50);
+    await dispatcher.drain();
+    assert.deepEqual(calls, [50]);
+});
+
+test('two fires back-to-back during in-flight — only the second runs after first settles', async () => {
+    const calls = [];
+    const gates = [deferred()];
+    const dispatcher = new DemandDispatcher(
+        { logger: silentLogger },
+        async (demand) => {
+            calls.push(demand);
+            await gates[0].promise;
+        },
+    );
+
+    dispatcher.fire(10);
+    // first invocation is now in flight (after a microtask)
+    await Promise.resolve();
+    await Promise.resolve();
+    dispatcher.fire(20);
+    // 20 should be pending, not yet run.
+    assert.deepEqual(calls, [10]);
+    gates[0].resolve();
+    await dispatcher.drain();
+    assert.deepEqual(calls, [10, 20]);
+});
+
+test('three rapid fires — only first + last run; middle dropped', async () => {
+    const calls = [];
+    const gate = deferred();
+    const dispatcher = new DemandDispatcher(
+        { logger: silentLogger },
+        async (demand) => {
+            calls.push(demand);
+            if (calls.length === 1) await gate.promise;
+        },
+    );
+
+    dispatcher.fire(1);
+    await Promise.resolve();
+    await Promise.resolve();
+    dispatcher.fire(2);
+    dispatcher.fire(3);   // overwrites the pending 2
+
+    assert.deepEqual(calls, [1]);
+    gate.resolve();
+    await dispatcher.drain();
+    assert.deepEqual(calls, [1, 3]);
+});
+
+test('drain() resolves only when idle', async () => {
+    const gate = deferred();
+    let runs = 0;
+    const dispatcher = new DemandDispatcher(
+        { logger: silentLogger },
+        async () => { runs++; await gate.promise; },
+    );
+
+    // drain() on an idle gate resolves immediately.
+    await dispatcher.drain();
+
+    dispatcher.fire('a');
+    let drained = false;
+    const drainPromise = dispatcher.drain().then(() => { drained = true; });
+    // Let a few microtasks run — drain must NOT be resolved while in flight.
+    for (let i = 0; i < 5; i++) await Promise.resolve();
+    assert.equal(drained, false);
+    assert.equal(runs, 1);
+    gate.resolve();
+    await drainPromise;
+    assert.equal(drained, true);
+});
+
+test('error in runFn does not deadlock; subsequent fire still works', async () => {
+    const calls = [];
+    const dispatcher = new DemandDispatcher(
+        { logger: silentLogger },
+        async (demand) => {
+            calls.push(demand);
+            if (demand === 'boom') throw new Error('boom');
+        },
+    );
+    dispatcher.fire('boom');
+    await dispatcher.drain();
+    dispatcher.fire('ok');
+    await dispatcher.drain();
+    assert.deepEqual(calls, ['boom', 'ok']);
+});
+
+test('inFlight getter reports correctly', async () => {
+    const gate = deferred();
+    const dispatcher = new DemandDispatcher(
+        { logger: silentLogger },
+        async () => { await gate.promise; },
+    );
+    assert.equal(dispatcher.inFlight, false);
+    dispatcher.fire(1);
+    // Microtask scheduling — gate flips to inFlight after one tick.
+    await Promise.resolve();
+    assert.equal(dispatcher.inFlight, true);
+    gate.resolve();
+    await dispatcher.drain();
+    assert.equal(dispatcher.inFlight, false);
+});
+
+test('runFn receives the ctx supplied at construction', async () => {
+    const seen = [];
+    const ctx = { logger: silentLogger, marker: 'mgc-A' };
+    const dispatcher = new DemandDispatcher(
+        ctx,
+        async (demand, runCtx) => { seen.push({ demand, marker: runCtx.marker }); },
+    );
+    dispatcher.fire(42);
+    await dispatcher.drain();
+    assert.deepEqual(seen, [{ demand: 42, marker: 'mgc-A' }]);
+});

test/basic/equalFlowDistribution.basic.test.js

@@ -0,0 +1,132 @@
+// Unit tests for the pure distribution math extracted out of equalFlowControl.
+// Decoupling target: the algorithm should be testable without a full MGC.
+
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { computeEqualFlowDistribution } = require('../../src/control/strategies.js');
+
+// Tiny helpers to make synthetic machines. The pure function still calls
+// filterOutUnavailableMachines, which reads machine.state.getCurrentState()
+// and machine.isValidActionForMode() — stub both so the algorithm sees the
+// machine as available. groupFlow/groupCalcPower are injected.
+function mkMachine(id, capability = { min: 0.01, max: 0.10, power: (flow) => flow * 1000 }, state = 'operational') {
+    return {
+        id,
+        machine: {
+            __testCapability: capability,
+            state: { getCurrentState: () => state },
+            isValidActionForMode: () => true,
+        },
+    };
+}
+const dummyLogger = { warn() {}, error() {}, debug() {}, info() {} };
+
+// Default injected helpers: read from the synthetic machine's __testCapability.
+const groupFlow = (m) => ({
+    currentFxyYMin: m.__testCapability.min,
+    currentFxyYMax: m.__testCapability.max,
+});
+const groupCalcPower = (m, flow) => m.__testCapability.power(flow);
+
+function basicArgs(overrides = {}) {
+    const m = { a: mkMachine('a').machine, b: mkMachine('b').machine, c: mkMachine('c').machine };
+    return {
+        machines: m, Qd: 0.06,
+        dynamicTotals: { flow: { min: 0.01, max: 0.30 } },
+        activeTotals:  { flow: { min: 0.03, max: 0.30 } },
+        priorityList: ['a', 'b', 'c'],
+        isMachineActive: () => true,
+        groupFlow, groupCalcPower, logger: dummyLogger,
+        ...overrides,
+    };
+}
+
+test('default case: distributes Qd equally across active machines', () => {
+    const r = computeEqualFlowDistribution(basicArgs({ Qd: 0.06 }));
+    // 3 active pumps, demand 0.06 → 0.02 per pump.
+    assert.equal(r.flowDistribution.length, 3);
+    for (const entry of r.flowDistribution) {
+        assert.ok(Math.abs(entry.flow - 0.02) < 1e-12, `entry.flow=${entry.flow}`);
+    }
+    assert.ok(Math.abs(r.totalFlow - 0.06) < 1e-12);
+    // power(flow) = flow * 1000 in the test capability → 0.02 * 1000 = 20 W per pump.
+    assert.ok(Math.abs(r.totalPower - 60) < 1e-9);
+});
+
+test('Qd above active capacity: starts additional priority machines until covered', () => {
+    // Only one machine "active" to start with; demand exceeds its envelope.
+    // Algorithm should bring more priority machines online via the high-demand branch.
+    const active = new Set(['a']);
+    const args = basicArgs({
+        Qd: 0.18, // above any single pump's max (0.10)
+        activeTotals: { flow: { min: 0.01, max: 0.10 } },
+        isMachineActive: (id) => active.has(id),
+    });
+    const r = computeEqualFlowDistribution(args);
+    // The algorithm reduces Qd iteratively (Qd /= i) until it fits per-pump max.
+    // We don't assert exact splits — only that flowDistribution is non-empty
+    // and totalFlow is finite, since the legacy algorithm is preserved as-is.
+    assert.ok(r.flowDistribution.length >= 1);
+    assert.ok(Number.isFinite(r.totalFlow));
+    assert.ok(Number.isFinite(r.totalPower));
+});
+
+test('Qd below active min flow: routes excess machines to flow=0 and redistributes', () => {
+    // demand below active min — algorithm shuts off lowest-priority machine(s)
+    // and redistributes Qd across the remainder.
+    const args = basicArgs({
+        Qd: 0.015,
+        dynamicTotals: { flow: { min: 0.01, max: 0.30 } },
+        activeTotals:  { flow: { min: 0.03, max: 0.30 } }, // active min > Qd
+    });
+    const r = computeEqualFlowDistribution(args);
+    const offCount = r.flowDistribution.filter(e => e.flow === 0).length;
+    assert.ok(offCount >= 1, `expected ≥1 machine to be shut off, got distribution: ${JSON.stringify(r.flowDistribution)}`);
+    const totalServed = r.flowDistribution.filter(e => e.flow > 0).reduce((s, e) => s + e.flow, 0);
+    assert.ok(Math.abs(totalServed - 0.015) < 1e-12, `served flow ${totalServed} should equal Qd 0.015`);
+});
+
+test('totalCog is always 0 for equalFlow — preserves legacy contract', () => {
+    // The historical algorithm sets totalCog = 0 in this strategy (BEP-Gravitation
+    // is the only optimizer that produces a meaningful per-combination cog).
+    // Pinned here so a future "improvement" doesn't silently introduce a fake value.
+    const r = computeEqualFlowDistribution(basicArgs());
+    assert.equal(r.totalCog, 0);
+});
+
+test('isMachineActive is consulted for COUNT but not for SELECTION (legacy quirk)', () => {
+    // Pins pre-existing behaviour of the default branch: it counts how many
+    // machines are active (countActive) to decide how to split Qd, but then
+    // iterates the FIRST countActive machines in priority order — which may
+    // include inactive ones. So 2 of 3 active + Qd within range → first 2 in
+    // priorityList both get flow, regardless of which are actually active.
+    //
+    // This is a latent bug that pre-dates the strategies decoupling refactor.
+    // Documenting it here so a future cleanup is a deliberate change with a
+    // failing-then-passing test, not a silent semantic shift.
+    const active = new Set(['a', 'c']);
+    const r = computeEqualFlowDistribution(basicArgs({
+        Qd: 0.06,
+        isMachineActive: (id) => active.has(id),
+    }));
+    // Today: machinesInPriorityOrder[0]='a', [1]='b' → 'a' and 'b' both get 0.03.
+    // 'c' (active but third in priority order) gets nothing.
+    const aFlow = r.flowDistribution.find(e => e.machineId === 'a')?.flow;
+    const bFlow = r.flowDistribution.find(e => e.machineId === 'b')?.flow;
+    const cFlow = r.flowDistribution.find(e => e.machineId === 'c')?.flow;
+    assert.equal(aFlow, 0.03, 'a (priority 0, active)');
+    assert.equal(bFlow, 0.03, 'b (priority 1, INACTIVE — receives flow anyway, bug)');
+    assert.equal(cFlow, undefined, 'c (priority 2, active — does NOT receive flow, bug)');
+});
+
+test('priorityList controls iteration order', () => {
+    // The order in flowDistribution should match priorityList — i.e., machine 'c'
+    // appears before machine 'a' when priorityList = ['c', 'b', 'a'].
+    const r = computeEqualFlowDistribution(basicArgs({
+        priorityList: ['c', 'b', 'a'],
+    }));
+    assert.equal(r.flowDistribution[0].machineId, 'c');
+});

test/basic/groupCurves.basic.test.js

@@ -0,0 +1,66 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const { groupFlow, groupPower, groupNCog, groupCalcPower } = require('../../src/groupOps/groupCurves');
+
+function predictView(min, max, current = (min + max) / 2) {
+    return {
+        currentF: current,
+        currentFxyYMin: min,
+        currentFxyYMax: max,
+    };
+}
+
+test('groupFlow returns the same shape as the original _groupFlow (groupPredictFlow preferred)', () => {
+    const machine = {
+        predictFlow:      predictView(0, 1, 0.5),
+        groupPredictFlow: predictView(0.1, 0.9, 0.4),
+    };
+    const v = groupFlow(machine);
+    assert.equal(v, machine.groupPredictFlow);
+    assert.equal(v.currentFxyYMin, 0.1);
+    assert.equal(v.currentFxyYMax, 0.9);
+    assert.equal(v.currentF, 0.4);
+});
+
+test('groupFlow falls back to predictFlow when groupPredictFlow is absent', () => {
+    const machine = { predictFlow: predictView(0, 1) };
+    assert.equal(groupFlow(machine), machine.predictFlow);
+});
+
+test('groupPower returns groupPredictPower when present, else predictPower', () => {
+    const m1 = { predictPower: predictView(0, 100), groupPredictPower: predictView(10, 90) };
+    assert.equal(groupPower(m1), m1.groupPredictPower);
+
+    const m2 = { predictPower: predictView(0, 100) };
+    assert.equal(groupPower(m2), m2.predictPower);
+});
+
+test('groupNCog returns the group value when groupPredictFlow is present', () => {
+    const m = { groupPredictFlow: predictView(0, 1), groupNCog: 0.42, NCog: 0.99, predictFlow: predictView(0, 1) };
+    assert.equal(groupNCog(m), 0.42);
+});
+
+test('groupNCog falls back to NCog when no groupPredictFlow', () => {
+    const m = { predictFlow: predictView(0, 1), NCog: 0.7 };
+    assert.equal(groupNCog(m), 0.7);
+});
+
+test('groupNCog defaults to 0 when neither is defined', () => {
+    const m = { predictFlow: predictView(0, 1) };
+    assert.equal(groupNCog(m), 0);
+});
+
+test('groupCalcPower prefers machine.groupCalcPower', () => {
+    let lastFlow = null;
+    const m = {
+        groupCalcPower(flow) { lastFlow = flow; return flow * 2; },
+        inputFlowCalcPower(flow) { return flow * 999; },
+    };
+    assert.equal(groupCalcPower(m, 0.3), 0.6);
+    assert.equal(lastFlow, 0.3);
+});
+
+test('groupCalcPower falls back to inputFlowCalcPower when groupCalcPower missing', () => {
+    const m = { inputFlowCalcPower(flow) { return flow + 1; } };
+    assert.equal(groupCalcPower(m, 5), 6);
+});

test/basic/groupEfficiency.basic.test.js

@@ -0,0 +1,90 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { interpolation } = require('generalFunctions');
+const GroupEfficiency = require('../../src/efficiency/groupEfficiency.js');
+
+function makeMachines(cogs) {
+    const out = {};
+    cogs.forEach((cog, i) => { out[`m${i}`] = { cog }; });
+    return out;
+}
+
+function makeGE(extra = {}) {
+    return new GroupEfficiency({
+        interpolation: new interpolation(),
+        logger: { warn() {}, error() {}, debug() {}, info() {} },
+        ...extra,
+    });
+}
+
+test('calcGroupEfficiency aggregates across 3 machines', () => {
+    const ge = makeGE();
+    const machines = makeMachines([0.9, 0.8, 0.7]);
+    const { maxEfficiency, lowestEfficiency } = ge.calcGroupEfficiency(machines);
+    assert.equal(lowestEfficiency, 0.7);
+    // maxEfficiency in the original code is actually the MEAN cog.
+    assert.ok(Math.abs(maxEfficiency - 0.8) < 1e-12);
+});
+
+test('calcDistanceFromPeak returns |a - b|', () => {
+    const ge = makeGE();
+    assert.ok(Math.abs(ge.calcDistanceFromPeak(0.85, 0.92) - 0.07) < 1e-12);
+    assert.ok(Math.abs(ge.calcDistanceFromPeak(0.92, 0.85) - 0.07) < 1e-12);
+});
+
+test('calcRelativeDistanceFromPeak maps current onto [0..1]', () => {
+    const ge = makeGE();
+    // current=0.85, max=0.92, min=0.7 → maps 0.85 in [0.92..0.7] onto [0..1].
+    // interpolate_lin_single_point treats first range as input domain:
+    // 0.85 → ((0.85 - 0.92) / (0.7 - 0.92)) * (1 - 0) + 0 = 0.07/0.22 ≈ 0.3181818...
+    const v = ge.calcRelativeDistanceFromPeak(0.85, 0.92, 0.7);
+    const expected = (0.85 - 0.92) / (0.7 - 0.92);
+    assert.ok(Math.abs(v - expected) < 1e-9, `got ${v} expected ${expected}`);
+});
+
+test('calcDistanceBEP returns both abs + rel', () => {
+    const ge = makeGE();
+    const { absDistFromPeak, relDistFromPeak } = ge.calcDistanceBEP(0.85, 0.92, 0.7);
+    assert.ok(Math.abs(absDistFromPeak - 0.07) < 1e-12);
+    const expectedRel = (0.85 - 0.92) / (0.7 - 0.92);
+    assert.ok(Math.abs(relDistFromPeak - expectedRel) < 1e-9);
+});
+
+test('calcRelativeDistanceFromPeak returns undefined when max === min (degenerate)', () => {
+    // For homogeneous pump groups (all cogs equal), the [max..min] band
+    // collapses and the metric is mathematically undefined. Return undefined
+    // so the dashboard displays "—" instead of a misleading 0% / 100%.
+    const ge = makeGE();
+    assert.equal(ge.calcRelativeDistanceFromPeak(0.85, 0.8, 0.8), undefined);
+});
+
+test('calcRelativeDistanceFromPeak returns undefined when max ≈ min within epsilon', () => {
+    // Float noise from identical pumps: max-min might be 1e-12 rather than 0.
+    // Must still report undefined — the interpolation extrapolates wildly here.
+    const ge = makeGE();
+    assert.equal(ge.calcRelativeDistanceFromPeak(0.85, 0.211264, 0.211263999), undefined);
+});
+
+test('calcRelativeDistanceFromPeak returns undefined when current is null', () => {
+    const ge = makeGE();
+    assert.equal(ge.calcRelativeDistanceFromPeak(null, 0.92, 0.7), undefined);
+});
+
+test('calcDistanceBEP propagates undefined relDist for degenerate input', () => {
+    // Regression: if currentEff is finite, absDist is still computed (it's
+    // just |current - peak|), but relDist must be undefined for degenerate.
+    const ge = makeGE();
+    const { absDistFromPeak, relDistFromPeak } = ge.calcDistanceBEP(0.206, 0.211, 0.211);
+    assert.ok(Math.abs(absDistFromPeak - 0.005) < 1e-9);
+    assert.equal(relDistFromPeak, undefined);
+});
+
+test('calcGroupEfficiency handles a single machine', () => {
+    const ge = makeGE();
+    const { maxEfficiency, lowestEfficiency } = ge.calcGroupEfficiency(makeMachines([0.77]));
+    assert.equal(maxEfficiency, 0.77);
+    assert.equal(lowestEfficiency, 0.77);
+});

test/basic/groupOperatingPoint.basic.test.js

@@ -0,0 +1,131 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const { MeasurementContainer, POSITIONS } = require('generalFunctions');
+const GroupOperatingPoint = require('../../src/groupOps/groupOperatingPoint');
+
+const unitPolicy = {
+    canonical: { pressure: 'Pa', flow: 'm3/s', power: 'W', temperature: 'K' },
+    output:    { pressure: 'Pa', flow: 'm3/s', power: 'W', temperature: 'K' },
+};
+
+const silentLogger = { debug() {}, info() {}, warn() {}, error() {} };
+
+function makeContainer() {
+    return new MeasurementContainer({
+        defaultUnits:   unitPolicy.output,
+        preferredUnits: unitPolicy.output,
+        canonicalUnits: unitPolicy.canonical,
+        storeCanonical: true,
+        autoConvert: true,
+    });
+}
+
+function makeMachine(id, pressures = {}) {
+    // pressures: { down?: Pa, up?: Pa }  — written into a real container
+    const m = {
+        config: { general: { id } },
+        measurements: makeContainer(),
+        setGroupOperatingPointCalls: [],
+        setGroupOperatingPoint(down, up) {
+            this.setGroupOperatingPointCalls.push({ down, up });
+        },
+    };
+    const now = Date.now();
+    if (pressures.down != null) {
+        m.measurements.type('pressure').variant('measured').position(POSITIONS.DOWNSTREAM).value(pressures.down, now, 'Pa');
+    }
+    if (pressures.up != null) {
+        m.measurements.type('pressure').variant('measured').position(POSITIONS.UPSTREAM).value(pressures.up, now, 'Pa');
+    }
+    return m;
+}
+
+test('readChild returns value in requested unit when present', () => {
+    const machines = {};
+    const m = makeMachine('m1', { down: 150000 });
+    machines[m.config.general.id] = m;
+    const gop = new GroupOperatingPoint({ measurements: makeContainer(), machines, unitPolicy, logger: silentLogger });
+
+    const v = gop.readChild(m, 'pressure', 'measured', POSITIONS.DOWNSTREAM, 'Pa');
+    assert.equal(v, 150000);
+});
+
+test('readChild returns null when measurement missing', () => {
+    const m = makeMachine('m1');
+    const gop = new GroupOperatingPoint({ measurements: makeContainer(), machines: { m1: m }, unitPolicy, logger: silentLogger });
+
+    const v = gop.readChild(m, 'pressure', 'measured', POSITIONS.UPSTREAM, 'Pa');
+    assert.equal(v, null);
+});
+
+test("writeOwn writes to the group's measurements container", () => {
+    const ownC = makeContainer();
+    const gop = new GroupOperatingPoint({ measurements: ownC, machines: {}, unitPolicy, logger: silentLogger });
+
+    gop.writeOwn('flow', 'predicted', POSITIONS.AT_EQUIPMENT, 0.1, 'm3/s');
+    const v = ownC.type('flow').variant('predicted').position(POSITIONS.AT_EQUIPMENT).getCurrentValue('m3/s');
+    assert.equal(v, 0.1);
+});
+
+test('writeOwn skips non-finite values', () => {
+    const ownC = makeContainer();
+    const gop = new GroupOperatingPoint({ measurements: ownC, machines: {}, unitPolicy, logger: silentLogger });
+
+    gop.writeOwn('flow', 'predicted', POSITIONS.AT_EQUIPMENT, NaN, 'm3/s');
+    const v = ownC.type('flow').variant('predicted').position(POSITIONS.AT_EQUIPMENT).getCurrentValue('m3/s');
+    assert.equal(v, null);
+});
+
+test('equalize() pushes the worst-case header onto each machine when 3 pressures differ', () => {
+    // No group header → max child downstream, min positive child upstream.
+    // max(120k, 140k, 100k) = 140000, min(80k, 90k, 70k) = 70000.
+    const machines = {
+        a: makeMachine('a', { down: 120000, up: 80000 }),
+        b: makeMachine('b', { down: 140000, up: 90000 }),
+        c: makeMachine('c', { down: 100000, up: 70000 }),
+    };
+    const gop = new GroupOperatingPoint({ measurements: makeContainer(), machines, unitPolicy, logger: silentLogger });
+
+    gop.equalize();
+
+    for (const id of ['a', 'b', 'c']) {
+        const last = machines[id].setGroupOperatingPointCalls.at(-1);
+        assert.ok(last, `machine ${id} should have been called`);
+        assert.equal(last.down, 140000);
+        assert.equal(last.up,   70000);
+    }
+});
+
+test('equalize() is a no-op when there is no pressure data', () => {
+    const machines = { a: makeMachine('a'), b: makeMachine('b') };
+    const gop = new GroupOperatingPoint({ measurements: makeContainer(), machines, unitPolicy, logger: silentLogger });
+
+    gop.equalize();
+
+    assert.equal(machines.a.setGroupOperatingPointCalls.length, 0);
+    assert.equal(machines.b.setGroupOperatingPointCalls.length, 0);
+});
+
+test('equalize() is a no-op when machines map is empty', () => {
+    const gop = new GroupOperatingPoint({ measurements: makeContainer(), machines: {}, unitPolicy, logger: silentLogger });
+    assert.doesNotThrow(() => gop.equalize());
+});
+
+test('equalize() falls back to direct fDimension when setGroupOperatingPoint is missing', () => {
+    const m = {
+        config: { general: { id: 'old' } },
+        measurements: makeContainer(),
+        predictFlow:  { fDimension: 0 },
+        predictPower: { fDimension: 0 },
+        predictCtrl:  { fDimension: 0 },
+    };
+    m.measurements.type('pressure').variant('measured').position(POSITIONS.DOWNSTREAM).value(200000, Date.now(), 'Pa');
+    m.measurements.type('pressure').variant('measured').position(POSITIONS.UPSTREAM).value(100000, Date.now(), 'Pa');
+
+    const gop = new GroupOperatingPoint({ measurements: makeContainer(), machines: { old: m }, unitPolicy, logger: silentLogger });
+    gop.equalize();
+
+    assert.equal(m.predictFlow.fDimension,  100000);
+    assert.equal(m.predictPower.fDimension, 100000);
+    assert.equal(m.predictCtrl.fDimension,  100000);
+});

test/basic/moveTrajectory.basic.test.js

@@ -0,0 +1,142 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MoveTrajectory = require('../../src/movement/moveTrajectory');
+
+// Reusable profile builder — keeps each test focused on the field(s) it cares
+// about. Anything not overridden is in a sane "operational at 0%" baseline.
+function makeProfile(over = {}) {
+    return Object.assign({
+        id: 'P1',
+        state: 'operational',
+        position: 0,
+        minPosition: 0,
+        maxPosition: 100,
+        velocityPctPerS: 2,
+        timings: { startingS: 10, warmingupS: 20, stoppingS: 5, coolingdownS: 15 },
+        remainingTransitionS: null,
+        flowAt: () => null,
+    }, over);
+}
+
+// TC1 — idle, full startup ladder + ramp from min.
+test('TC1 idle → target = startingS + warmingupS + (target−min)/velocity', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'idle' }), { targetPosition: 60 });
+    assert.equal(t.etaToTargetS(), 10 + 20 + 60 / 2); // 60s
+});
+
+// TC2 — operational up.
+test('TC2 operational up = |target−position|/velocity', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'operational', position: 40 }), { targetPosition: 60 });
+    assert.equal(t.etaToTargetS(), 10);
+});
+
+// TC3 — operational down. ETA is positive.
+test('TC3 operational down = |target−position|/velocity', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'operational', position: 80 }), { targetPosition: 30 });
+    assert.equal(t.etaToTargetS(), 25);
+});
+
+// TC4 — no-op.
+test('TC4 operational, target == position → 0s', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'operational', position: 50 }), { targetPosition: 50 });
+    assert.equal(t.etaToTargetS(), 0);
+});
+
+// TC5 — accelerating post-abort residue, same formula as operational.
+test('TC5 accelerating residue = operational formula', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'accelerating', position: 35 }), { targetPosition: 60 });
+    assert.equal(t.etaToTargetS(), 12.5);
+});
+
+// TC6 — decelerating residue.
+test('TC6 decelerating residue = operational formula', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'decelerating', position: 70 }), { targetPosition: 40 });
+    assert.equal(t.etaToTargetS(), 15);
+});
+
+// TC7 — warmingup, remaining time from stateManager.
+test('TC7 warmingup = remainingWarmupS + (target−min)/velocity', () => {
+    const t = new MoveTrajectory(makeProfile({
+        state: 'warmingup',
+        position: 0,
+        remainingTransitionS: 12,
+    }), { targetPosition: 50 });
+    assert.equal(t.etaToTargetS(), 12 + 50 / 2); // 37s
+});
+
+// TC7b — warmingup but no remaining-time observation: falls back to full
+// configured warmup (worst-case). Kept for resilience when the state machine
+// pre-dates the getter.
+test('TC7b warmingup fallback to full warmingupS when no remaining provided', () => {
+    const t = new MoveTrajectory(makeProfile({
+        state: 'warmingup',
+        position: 0,
+        remainingTransitionS: null,
+    }), { targetPosition: 50 });
+    assert.equal(t.etaToTargetS(), 20 + 50 / 2); // 45s
+});
+
+// TC8 — starting: remaining + full warmup + ramp.
+test('TC8 starting = remainingStartingS + warmingupS + (target−min)/velocity', () => {
+    const t = new MoveTrajectory(makeProfile({
+        state: 'starting',
+        position: 0,
+        remainingTransitionS: 8,
+    }), { targetPosition: 50 });
+    assert.equal(t.etaToTargetS(), 8 + 20 + 50 / 2); // 53s
+});
+
+// TC8b — boundary: remaining hits 0 just before the setTimeout fires.
+test('TC8b starting with remainingTransitionS=0 still yields positive ETA', () => {
+    const t = new MoveTrajectory(makeProfile({
+        state: 'starting',
+        position: 0,
+        remainingTransitionS: 0,
+    }), { targetPosition: 50 });
+    assert.equal(t.etaToTargetS(), 0 + 20 + 50 / 2); // 45s
+});
+
+// TC9 — shutdown ladder excluded: returns null so scheduler skips it.
+test('TC9a stopping → null', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'stopping', position: 30 }), { targetPosition: 0 });
+    assert.equal(t.etaToTargetS(), null);
+});
+test('TC9b coolingdown → null', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'coolingdown', position: 0 }), { targetPosition: 0 });
+    assert.equal(t.etaToTargetS(), null);
+});
+
+// TC10 — target above max clamps; ETA uses clamped value.
+test('TC10 target above maxPosition clamps to max', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'operational', position: 0, maxPosition: 100 }), { targetPosition: 120 });
+    assert.equal(t.targetPosition, 100);
+    assert.equal(t.etaToTargetS(), 50);
+});
+
+// TC11 — target below min clamps; ETA zero when already at min.
+test('TC11 target below min clamps to min; ETA = 0 when at min', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'operational', position: 0, minPosition: 0 }), { targetPosition: -5 });
+    assert.equal(t.targetPosition, 0);
+    assert.equal(t.etaToTargetS(), 0);
+});
+
+// TC12 — zero velocity yields Infinity, not NaN or crash.
+test('TC12 zero velocity → Infinity', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'operational', position: 0, velocityPctPerS: 0 }), { targetPosition: 50 });
+    assert.equal(t.etaToTargetS(), Infinity);
+});
+
+// TC13 — non-finite target throws at construction (totality of etaToTargetS).
+test('TC13 non-finite target throws at construction', () => {
+    assert.throws(() => new MoveTrajectory(makeProfile(), { targetPosition: NaN }), TypeError);
+    assert.throws(() => new MoveTrajectory(makeProfile(), { targetPosition: undefined }), TypeError);
+});
+
+// Extra: minPosition above 0 is honoured in ramp distance for startup cases.
+test('TC1b idle with minPosition=10 → ramp from 10, not 0', () => {
+    const t = new MoveTrajectory(makeProfile({ state: 'idle', minPosition: 10 }), { targetPosition: 60 });
+    assert.equal(t.etaToTargetS(), 10 + 20 + (60 - 10) / 2); // 55s
+});

test/basic/movement-gate.basic.test.js

@@ -0,0 +1,86 @@
+// Unit tests for the MGC movement state + rendezvous-lock helpers
+// (getMovementState / _isEmergencyDemand / _pressureEmergency). Exercised via
+// prototype.call with a
+// minimal fake `this` so no Node-RED runtime or full MachineGroup boot is
+// needed. See project rule .claude/rules/testing.md (basic = pure logic).
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MachineGroup = require('../../src/specificClass');
+
+function machine(state, { delayedMove = null, moveTimeLeft = 0 } = {}) {
+  return { state: { getCurrentState: () => state, delayedMove, getMoveTimeLeft: () => moveTimeLeft } };
+}
+function movementStateOf(machines, pending = 0) {
+  return MachineGroup.prototype.getMovementState.call({
+    machines,
+    movementExecutor: { pending: () => pending },
+  });
+}
+
+test('movementState: ready when no machines are registered', () => {
+  assert.equal(movementStateOf({}), 'ready');
+});
+test('movementState: ready when every machine is settled and nothing is pending', () => {
+  assert.equal(movementStateOf({ a: machine('operational'), b: machine('idle') }), 'ready');
+});
+test('movementState: working while a machine is mid-ramp', () => {
+  assert.equal(movementStateOf({ a: machine('operational'), b: machine('accelerating') }), 'working');
+});
+test('movementState: working during a start/stop sequence step', () => {
+  assert.equal(movementStateOf({ a: machine('warmingup') }), 'working');
+});
+test('movementState: working when a setpoint is queued (delayedMove)', () => {
+  assert.equal(movementStateOf({ a: machine('operational', { delayedMove: 50 }) }), 'working');
+});
+test('movementState: working while move time remains', () => {
+  assert.equal(movementStateOf({ a: machine('operational', { moveTimeLeft: 1.2 }) }), 'working');
+});
+test('movementState: working when the executor still has scheduled commands', () => {
+  assert.equal(movementStateOf({ a: machine('operational') }, 2), 'working');
+});
+
+// Rendezvous lock: only an EMERGENCY pre-empts an in-flight rendezvous; every
+// ordinary setpoint (any size, mode/priority change included) defers.
+function emergency(demandQ, { last = 10, emergency = false } = {}) {
+  return MachineGroup.prototype._isEmergencyDemand.call({
+    _lastDemand: last == null ? null : { canonical: last },
+  }, demandQ, { emergency });
+}
+
+test('emergency: a stop (≤0) always pre-empts', () => {
+  assert.equal(emergency(0), true);
+  assert.equal(emergency(-5), true);
+});
+test('emergency: the first demand (no prior) dispatches immediately', () => {
+  assert.equal(emergency(50, { last: null }), true);
+});
+test('emergency: an explicit emergency flag pre-empts', () => {
+  assert.equal(emergency(60, { last: 10, emergency: true }), true);
+});
+test('emergency: an ordinary same-mode step defers (large or small)', () => {
+  assert.equal(emergency(12, { last: 10 }), false); // small nudge — defer
+  assert.equal(emergency(60, { last: 10 }), false); // large step — also defers now
+});
+
+// Pressure-excursion detector — inert until planner.emergencyPressurePa is set.
+function pressureEmergency({ thr, headerPa } = {}) {
+  return MachineGroup.prototype._pressureEmergency.call({
+    config: { planner: thr == null ? {} : { emergencyPressurePa: thr } },
+    operatingPoint: { headerDiffPa: headerPa },
+  });
+}
+
+test('pressureEmergency: inert (false) when no threshold is configured', () => {
+  assert.equal(pressureEmergency({ headerPa: 999999 }), false);
+});
+test('pressureEmergency: false when header is below the configured threshold', () => {
+  assert.equal(pressureEmergency({ thr: 200000, headerPa: 150000 }), false);
+});
+test('pressureEmergency: true when header breaches the configured threshold', () => {
+  assert.equal(pressureEmergency({ thr: 200000, headerPa: 210000 }), true);
+});
+test('pressureEmergency: false when header pressure is unknown', () => {
+  assert.equal(pressureEmergency({ thr: 200000, headerPa: undefined }), false);
+});

test/basic/movementExecutor.basic.test.js

@@ -0,0 +1,136 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MovementExecutor = require('../../src/movement/movementExecutor');
+
+function mkSchedule(commands, tStarS = 0, tickS = 1) {
+    return { tStarS, tickS, commands };
+}
+
+const noopLogger = { debug() {}, info() {}, warn() {}, error() {} };
+
+test('executor: throws if fireCommand callback missing', () => {
+    assert.throws(() => new MovementExecutor({}), TypeError);
+});
+
+test('executor: fires commands whose fireAtTickN <= cursor', async () => {
+    const fired = [];
+    const ex = new MovementExecutor({
+        fireCommand: (c) => fired.push(c),
+        logger: noopLogger,
+    });
+    ex.replan(mkSchedule([
+        { machineId: 'A', action: 'flowmovement', flow: 60, fireAtTickN: 0, eta: 0 },
+        { machineId: 'B', action: 'flowmovement', flow: 40, fireAtTickN: 2, eta: 2 },
+        { machineId: 'C', action: 'flowmovement', flow: 30, fireAtTickN: 5, eta: 5 },
+    ]));
+    let firedThisTick = await ex.tick();
+    assert.equal(firedThisTick.length, 1);
+    assert.equal(firedThisTick[0].machineId, 'A');
+    firedThisTick = await ex.tick();
+    assert.equal(firedThisTick.length, 0);
+    firedThisTick = await ex.tick();
+    assert.equal(firedThisTick.length, 1);
+    assert.equal(firedThisTick[0].machineId, 'B');
+    await ex.tick(); await ex.tick();
+    firedThisTick = await ex.tick();
+    assert.equal(firedThisTick.length, 1);
+    assert.equal(firedThisTick[0].machineId, 'C');
+
+    assert.deepEqual(fired.map((c) => c.machineId), ['A', 'B', 'C']);
+    assert.equal(ex.pending(), 0);
+});
+
+test('executor: replan drops unfired commands and resets cursor', async () => {
+    const fired = [];
+    const ex = new MovementExecutor({ fireCommand: (c) => fired.push(c.machineId), logger: noopLogger });
+
+    ex.replan(mkSchedule([
+        { machineId: 'A', action: 'flowmovement', flow: 60, fireAtTickN: 0, eta: 0 },
+        { machineId: 'B', action: 'flowmovement', flow: 40, fireAtTickN: 10, eta: 10 },
+    ]));
+    await ex.tick(); // A fires
+    assert.deepEqual(fired, ['A']);
+    assert.equal(ex.pending(), 1);
+
+    ex.replan(mkSchedule([
+        { machineId: 'X', action: 'flowmovement', flow: 80, fireAtTickN: 0, eta: 0 },
+        { machineId: 'Y', action: 'flowmovement', flow: 20, fireAtTickN: 3, eta: 3 },
+    ]));
+    assert.equal(ex.cursor(), 0, 'cursor reset on replan');
+    await ex.tick(); // X fires
+    assert.deepEqual(fired, ['A', 'X']);
+    await ex.tick(); await ex.tick(); await ex.tick();
+    assert.ok(!fired.includes('B'), 'old B move was dropped by replan');
+    assert.ok(fired.includes('Y'), 'new Y move fired after delay');
+});
+
+test('executor: fires only once per command even across many ticks', async () => {
+    const fired = [];
+    const ex = new MovementExecutor({ fireCommand: (c) => fired.push(c.machineId), logger: noopLogger });
+    ex.replan(mkSchedule([
+        { machineId: 'A', action: 'flowmovement', flow: 60, fireAtTickN: 0, eta: 0 },
+    ]));
+    for (let i = 0; i < 5; i++) await ex.tick();
+    assert.deepEqual(fired, ['A']);
+});
+
+test('executor: catches fireCommand errors and continues', async () => {
+    const fired = [];
+    const ex = new MovementExecutor({
+        fireCommand: (c) => {
+            if (c.machineId === 'B') throw new Error('boom');
+            fired.push(c.machineId);
+        },
+        logger: noopLogger,
+    });
+    ex.replan(mkSchedule([
+        { machineId: 'A', action: 'flowmovement', flow: 60, fireAtTickN: 0, eta: 0 },
+        { machineId: 'B', action: 'flowmovement', flow: 40, fireAtTickN: 0, eta: 0 },
+        { machineId: 'C', action: 'flowmovement', flow: 30, fireAtTickN: 0, eta: 0 },
+    ]));
+    await ex.tick();
+    // B's error must not block A or C.
+    assert.deepEqual(fired, ['A', 'C']);
+});
+
+test('executor: empty / null schedule is safe to tick', async () => {
+    const ex = new MovementExecutor({ fireCommand: () => {}, logger: noopLogger });
+    assert.deepEqual(await ex.tick(), []);
+    ex.replan({ commands: [] });
+    assert.deepEqual(await ex.tick(), []);
+});
+
+test('executor: tick fires commands synchronously and does NOT await their promises', async () => {
+    // Contract: tick() returns as soon as every due fireCommand has been
+    // invoked. It does NOT wait for the returned promises to resolve.
+    // This matters because a flowmovement-after-startup resolves only
+    // after the pump's entire ramp completes — awaiting it would freeze
+    // the executor's wall-clock progression and drag every delayed
+    // command in the schedule forward by that duration.
+    const order = [];
+    let resolveFire;
+    const firePromise = new Promise((r) => { resolveFire = r; });
+    const ex = new MovementExecutor({
+        fireCommand: (c) => {
+            order.push(`fire-start-${c.machineId}`);
+            return firePromise.then(() => { order.push(`fire-end-${c.machineId}`); });
+        },
+        logger: noopLogger,
+    });
+    ex.replan(mkSchedule([
+        { machineId: 'A', action: 'flowmovement', flow: 60, fireAtTickN: 0, eta: 0 },
+    ]));
+    const tickPromise = ex.tick().then(() => order.push('tick-resolved'));
+    // Wait one microtask cycle: tick should already have resolved even
+    // though fire is still pending.
+    await new Promise((r) => setTimeout(r, 10));
+    assert.deepEqual(order, ['fire-start-A', 'tick-resolved'],
+        'tick must resolve immediately after invoking fireCommand — not wait for its promise');
+    resolveFire();
+    await tickPromise;
+    // The fire's tail runs in the background and lands after tick resolved.
+    assert.deepEqual(order, ['fire-start-A', 'tick-resolved', 'fire-end-A']);
+});

test/basic/movementScheduler.basic.test.js

@@ -0,0 +1,302 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { plan } = require('../../src/movement/movementScheduler');
+
+// Profile builder — same shape as buildProfile output. positionForFlow
+// approximates the inverse curve as a linear mapping over [min,max] for
+// flow ∈ [0, maxFlow], which is enough to test scheduler logic without
+// dragging real curve math in.
+function makeProfile(over = {}) {
+    const defaults = {
+        id: 'A',
+        state: 'operational',
+        position: 0,
+        minPosition: 0,
+        maxPosition: 100,
+        velocityPctPerS: 2,
+        timings: { startingS: 10, warmingupS: 20, stoppingS: 5, coolingdownS: 15 },
+        remainingTransitionS: null,
+        maxFlow: 100, // synthetic — for the test mapping below
+    };
+    const p = Object.assign(defaults, over);
+    // Linear position-for-flow over [min,max].
+    p.positionForFlow = (flow) => {
+        if (!Number.isFinite(flow) || flow <= 0) return p.minPosition;
+        return p.minPosition + (flow / p.maxFlow) * (p.maxPosition - p.minPosition);
+    };
+    // flowAt — inverse of the above.
+    p.flowAt = (pos /*, pressure */) => {
+        if (!Number.isFinite(pos)) return 0;
+        if (p.maxPosition === p.minPosition) return 0;
+        return ((pos - p.minPosition) / (p.maxPosition - p.minPosition)) * p.maxFlow;
+    };
+    return p;
+}
+
+// Tick rounding helper — scheduler uses Math.round(eta/tickS).
+function tickRound(s, tickS = 1) { return Math.round(s / tickS); }
+
+test('plan: idle → start a single pump (no other pumps online)', () => {
+    const profiles = [makeProfile({ id: 'A', state: 'idle', position: 0 })];
+    const combination = [{ machineId: 'A', flow: 60 }];
+
+    const out = plan(profiles, combination, 100_000);
+    // Two commands: execsequence(startup) + flowmovement(60). Both at tick 0.
+    assert.equal(out.commands.length, 2);
+    assert.equal(out.commands[0].action, 'execsequence');
+    assert.equal(out.commands[0].sequence, 'startup');
+    assert.equal(out.commands[0].fireAtTickN, 0);
+    assert.equal(out.commands[1].action, 'flowmovement');
+    assert.equal(out.commands[1].flow, 60);
+    assert.equal(out.commands[1].fireAtTickN, 0);
+    // tStar = full startup ladder + ramp from 0 to position-for-60 (= 60%).
+    // = 10 + 20 + 60/2 = 60s.
+    assert.equal(out.tStarS, 60);
+});
+
+test('plan: operational up-move (no rendezvous partner)', () => {
+    const profiles = [makeProfile({ id: 'A', state: 'operational', position: 40 })];
+    // Currently delivering 40 (at maxFlow=100 → linear), targeting 60.
+    const combination = [{ machineId: 'A', flow: 60 }];
+
+    const out = plan(profiles, combination, 100_000);
+    assert.equal(out.commands.length, 1);
+    assert.equal(out.commands[0].action, 'flowmovement');
+    assert.equal(out.commands[0].flow, 60);
+    assert.equal(out.commands[0].fireAtTickN, 0);
+    // eta = |60−40|/2 = 10s
+    assert.equal(out.tStarS, 10);
+});
+
+test('plan: rendezvous — startup pump + running pump that needs to shed load', () => {
+    // A: starting from idle, target 60. eta = 10 + 20 + 60/2 = 60s.
+    // B: operational at 80 (flow=80), target 40 (down). eta_B = 40/2 = 20s.
+    // Expectation: A fires at tick 0; B fires at tick (60−20) = 40 so B
+    // FINISHES at the same time A reaches its target.
+    const profiles = [
+        makeProfile({ id: 'A', state: 'idle', position: 0 }),
+        makeProfile({ id: 'B', state: 'operational', position: 80 }),
+    ];
+    const combination = [
+        { machineId: 'A', flow: 60 },
+        { machineId: 'B', flow: 40 },
+    ];
+
+    const out = plan(profiles, combination, 100_000);
+    const cmdA_startup = out.commands.find((c) => c.machineId === 'A' && c.action === 'execsequence');
+    const cmdA_flow    = out.commands.find((c) => c.machineId === 'A' && c.action === 'flowmovement');
+    const cmdB         = out.commands.find((c) => c.machineId === 'B' && c.action === 'flowmovement');
+    assert.ok(cmdA_startup, 'A startup');
+    assert.ok(cmdA_flow,    'A flowmovement (queued)');
+    assert.ok(cmdB,         'B flowmovement');
+
+    assert.equal(cmdA_startup.fireAtTickN, 0);
+    assert.equal(cmdA_flow.fireAtTickN, 0);
+    // B delayed so it finishes at tStar=60 → fires at 60−20 = 40.
+    assert.equal(cmdB.fireAtTickN, 40);
+    assert.equal(out.tStarS, 60);
+});
+
+test('plan: all machines moving down — all land at slowest mover\'s eta', () => {
+    // Two operational pumps, both reducing flow. tStar = max eta over
+    // ALL non-noop moves (not just increasing) so the slower pump
+    // defines the rendezvous and the faster one is delayed to land
+    // with it. Net effect: same-time landing in pure-down scenarios too,
+    // sum-of-flows stays at the OLD setpoint until t* then drops cleanly.
+    const profiles = [
+        makeProfile({ id: 'A', state: 'operational', position: 80, velocityPctPerS: 2 }),
+        makeProfile({ id: 'B', state: 'operational', position: 70, velocityPctPerS: 2 }),
+    ];
+    const combination = [
+        { machineId: 'A', flow: 40 }, // target position via inverse curve → 40 (identity makeProfile)
+        { machineId: 'B', flow: 30 },
+    ];
+
+    const out = plan(profiles, combination, 100_000);
+    // eta_A = |80-40|/2 = 20s, eta_B = |70-30|/2 = 20s → tStar = 20s.
+    assert.equal(out.tStarS, 20);
+    // Both pumps have eta == tStar so neither is delayed (fireAtTickN = 0).
+    for (const c of out.commands) {
+        assert.equal(c.fireAtTickN, 0, `${c.machineId} should fire at 0 when eta == tStar`);
+    }
+});
+
+test('plan: asymmetric down moves — faster one delayed to land with slower one', () => {
+    // A and B both reduce flow but A's move is faster. The new
+    // symmetric-rendezvous semantics delay the faster mover so both land
+    // at tStar = max eta.
+    const profiles = [
+        makeProfile({ id: 'A', state: 'operational', position: 60, velocityPctPerS: 4 }), // fast
+        makeProfile({ id: 'B', state: 'operational', position: 80, velocityPctPerS: 2 }), // slow
+    ];
+    const combination = [
+        { machineId: 'A', flow: 40 },
+        { machineId: 'B', flow: 40 },
+    ];
+
+    const out = plan(profiles, combination, 100_000);
+    // eta_A = |60-40|/4 = 5s, eta_B = |80-40|/2 = 20s → tStar = 20s.
+    assert.equal(out.tStarS, 20);
+    const cA = out.commands.find((c) => c.machineId === 'A');
+    const cB = out.commands.find((c) => c.machineId === 'B');
+    assert.equal(cA.fireAtTickN, 15, 'A (fast) delayed by tStar − eta_A = 20 − 5 = 15');
+    assert.equal(cB.fireAtTickN, 0,  'B (slow) defines tStar — fires immediately');
+});
+
+test('plan: shutdown — removed machine gets execsequence(shutdown)', () => {
+    // A staying at flow 60, B getting shut down (target 0).
+    const profiles = [
+        makeProfile({ id: 'A', state: 'operational', position: 60 }),
+        makeProfile({ id: 'B', state: 'operational', position: 50 }),
+    ];
+    const combination = [
+        { machineId: 'A', flow: 60 }, // unchanged
+        { machineId: 'B', flow: 0 },
+    ];
+
+    const out = plan(profiles, combination, 100_000);
+    const shutdownB = out.commands.find((c) => c.machineId === 'B' && c.action === 'execsequence' && c.sequence === 'shutdown');
+    assert.ok(shutdownB, 'B shutdown command present');
+});
+
+test('plan: noop — machine not in combination and already off does nothing', () => {
+    const profiles = [
+        makeProfile({ id: 'A', state: 'operational', position: 60 }),
+        makeProfile({ id: 'B', state: 'idle', position: 0 }),
+    ];
+    const combination = [{ machineId: 'A', flow: 60 }];
+
+    const out = plan(profiles, combination, 100_000);
+    const bAny = out.commands.find((c) => c.machineId === 'B');
+    assert.equal(bAny, undefined, 'B should be omitted (no-op)');
+});
+
+test('plan: rendezvous with three pumps — slowest startup sets the pace', () => {
+    // A: idle → 50 (full startup, slow).
+    // B: operational at 80 → 40 (down).
+    // C: operational at 30 → 50 (up, fast).
+    const profiles = [
+        makeProfile({ id: 'A', state: 'idle', position: 0 }),
+        makeProfile({ id: 'B', state: 'operational', position: 80 }),
+        makeProfile({ id: 'C', state: 'operational', position: 30 }),
+    ];
+    const combination = [
+        { machineId: 'A', flow: 50 },
+        { machineId: 'B', flow: 40 },
+        { machineId: 'C', flow: 50 },
+    ];
+
+    const out = plan(profiles, combination, 100_000);
+
+    // eta_A = 10 + 20 + 50/2 = 55s (startup ladder + ramp; defines tStar)
+    // eta_B = |80-40|/2 = 20s (decreasing)
+    // eta_C = |50-30|/2 = 10s (increasing)
+    // tStar = max(55, 20, 10) = 55.
+    assert.equal(out.tStarS, 55);
+
+    const cA = out.commands.find((c) => c.machineId === 'A' && c.action === 'execsequence');
+    const cC = out.commands.find((c) => c.machineId === 'C' && c.action === 'flowmovement');
+    const cB = out.commands.find((c) => c.machineId === 'B' && c.action === 'flowmovement');
+    // A's startup must begin NOW; its delayed flowmovement lands at t*
+    // by construction.
+    assert.equal(cA.fireAtTickN, 0);
+    // Symmetric rendezvous: BOTH B and C are delayed to land at t*.
+    // C (up, fast) gets delayed by t* − eta_C = 45.
+    // B (down, mid) gets delayed by t* − eta_B = 35.
+    assert.equal(cC.fireAtTickN, 55 - 10, 'C delayed to land at tStar (same-time landing)');
+    assert.equal(cB.fireAtTickN, 55 - 20, 'B delayed to land at tStar (same-time landing)');
+});
+
+test('plan: mixed-speed multi-startup — fast pumps wait so all land at tStar together', () => {
+    // Three idle pumps starting from min position. Different per-pump
+    // velocities → different etas. Without the rampStart gating, each
+    // pump's delayedMove would fire at warmup-end and ramp at its own
+    // speed, so the FAST pump lands long before the SLOW one — visible
+    // on the dashboard as staggered landing curves.
+    //
+    // Real-world reproducer: pumpingstation-complete-example with the
+    // editor's Reaction Speed set to A=3 %/s, B=10 %/s, C=1 %/s.
+    //
+    // Velocities here mirror that ratio but scaled for unit-test
+    // readability. Position range is [0,100] so rampDist = 100.
+    const profiles = [
+        makeProfile({ id: 'A', state: 'idle', position: 0, velocityPctPerS: 3 }),
+        makeProfile({ id: 'B', state: 'idle', position: 0, velocityPctPerS: 10 }),
+        makeProfile({ id: 'C', state: 'idle', position: 0, velocityPctPerS: 1 }),
+    ];
+    const combination = [
+        { machineId: 'A', flow: 100 },
+        { machineId: 'B', flow: 100 },
+        { machineId: 'C', flow: 100 },
+    ];
+
+    const out = plan(profiles, combination, 100_000);
+
+    // Default ladder = starting(10) + warmingup(20) = 30 s.
+    // ramp_A = 100/3  ≈ 33.33 s → eta_A ≈ 63.33 s
+    // ramp_B = 100/10 = 10 s   → eta_B = 40 s
+    // ramp_C = 100/1  = 100 s  → eta_C = 130 s
+    // tStar = max(eta_A, eta_B, eta_C) = 130 s.
+    assert.ok(Math.abs(out.tStarS - 130) < 0.01, `tStar should be 130; got ${out.tStarS}`);
+
+    // Just-in-time: the WHOLE startup (ladder + ramp) is delayed by (tStar −
+    // eta), so both execsequence and flowmovement fire at the same delayed
+    // tick. eta_A = 30 + 33.33 ≈ 63.33, eta_B = 40, eta_C = 130.
+    //   A: round(130 − 63.33) = 67
+    //   B: round(130 − 40)    = 90
+    //   C: round(130 − 130)   = 0  (slowest — defines tStar, fires now)
+    const delays = { A: Math.round(130 - (30 + 100 / 3)), B: 90, C: 0 };
+    for (const id of ['A', 'B', 'C']) {
+        const exec = out.commands.find((c) => c.machineId === id && c.action === 'execsequence');
+        const flow = out.commands.find((c) => c.machineId === id && c.action === 'flowmovement');
+        assert.ok(exec, `${id} execsequence present`);
+        assert.ok(flow, `${id} flowmovement present`);
+        assert.equal(exec.fireAtTickN, delays[id], `${id} ladder delayed to land at tStar`);
+        assert.equal(flow.fireAtTickN, delays[id], `${id} flowmovement fires with the ladder`);
+    }
+
+    // Sanity: with the ladder delayed, each pump reaches `operational` only at
+    // (delay + ladderS) and its ramp ends at the same wall-clock instant ≈ 130.
+    //   A: 67 + 30 (op) + 33.33 ≈ 130.33
+    //   B: 90 + 30 (op) + 10    = 130
+    //   C: 0  + 30 (op) + 100   = 130
+    // No pump sits at `operational` (and minimum flow) before its ramp — that
+    // early min-flow was the staging bump this just-in-time start removes.
+});
+
+test('plan: zero-velocity machine is demoted (infinite eta) but does not crash', () => {
+    const profiles = [
+        makeProfile({ id: 'A', state: 'operational', position: 0, velocityPctPerS: 0 }),
+    ];
+    const combination = [{ machineId: 'A', flow: 60 }];
+
+    const out = plan(profiles, combination, 100_000);
+    // Eta is Infinity → filtered out of tStar computation (only finite etas count).
+    // Command still scheduled; fireAtTickN remains 0 for increasing move.
+    const c = out.commands.find((c) => c.action === 'flowmovement');
+    assert.ok(c);
+    assert.equal(c.fireAtTickN, 0);
+    assert.equal(out.tStarS, 0); // no finite increasing eta → tStar collapses to 0
+});
+
+test('plan: respects custom tickS option', () => {
+    // Same as the rendezvous test but with tickS=5 → fireAt should be in
+    // ticks-of-5-seconds, not seconds.
+    const profiles = [
+        makeProfile({ id: 'A', state: 'idle', position: 0 }),
+        makeProfile({ id: 'B', state: 'operational', position: 80 }),
+    ];
+    const combination = [
+        { machineId: 'A', flow: 60 },
+        { machineId: 'B', flow: 40 },
+    ];
+
+    const out = plan(profiles, combination, 100_000, { tickS: 5 });
+    const cmdB = out.commands.find((c) => c.machineId === 'B');
+    assert.equal(out.tStarS, 60);
+    assert.equal(out.tickS, 5);
+    assert.equal(cmdB.fireAtTickN, tickRound(60 - 20, 5)); // = 8
+});

test/basic/pumpCombinations.basic.test.js

@@ -0,0 +1,90 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+// Local stub for groupCurves — replace once ../groupOps/groupCurves lands.
+const groupCurves = {
+    groupFlow: (m) => m.predictFlow,
+    groupPower: (m) => m.predictPower,
+    groupNCog: (m) => m.NCog ?? 0,
+    groupCalcPower: (m, f) => m.inputFlowCalcPower(f),
+};
+
+const { validPumpCombinations, checkSpecialCases } =
+    require('../../src/combinatorics/pumpCombinations');
+
+function makeMachine({ id, state = 'off', mode = 'auto',
+                       fMin = 0, fMax = 100, pMax = 100,
+                       NCog = 0.5, validAction = true } = {}) {
+    return {
+        config: { general: { id } },
+        state: { getCurrentState: () => state },
+        currentMode: mode,
+        NCog,
+        predictFlow: { currentFxyYMin: fMin, currentFxyYMax: fMax },
+        predictPower: { currentFxyYMin: 0, currentFxyYMax: pMax },
+        inputFlowCalcPower: (flow) => flow * 0.5,
+        isValidActionForMode: () => validAction,
+    };
+}
+
+const POSITIONS = { DOWNSTREAM: 'downstream' };
+const baseCtx = (extra = {}) => ({
+    groupCurves,
+    logger: { warn: () => {}, debug: () => {}, error: () => {} },
+    readChildMeasurement: () => undefined,
+    POSITIONS,
+    unitPolicy: { canonical: { flow: 'm3/s' } },
+    ...extra,
+});
+
+test('validPumpCombinations: 3 idle machines + Qd in range returns subsets that can deliver', () => {
+    const machines = {
+        a: makeMachine({ id: 'a', state: 'idle', fMin: 10, fMax: 50 }),
+        b: makeMachine({ id: 'b', state: 'idle', fMin: 10, fMax: 50 }),
+        c: makeMachine({ id: 'c', state: 'idle', fMin: 10, fMax: 50 }),
+    };
+    const combos = validPumpCombinations(machines, 40, baseCtx());
+    assert.ok(combos.length > 0, 'expected at least one combination');
+    // every combination must be able to deliver Qd
+    for (const subset of combos) {
+        const maxF = subset.reduce((s, id) => s + machines[id].predictFlow.currentFxyYMax, 0);
+        const minF = subset.reduce((s, id) => s + machines[id].predictFlow.currentFxyYMin, 0);
+        assert.ok(maxF >= 40);
+        assert.ok(minF <= 40);
+    }
+});
+
+test('validPumpCombinations: excludes machines in off/coolingdown/stopping/emergencystop', () => {
+    const machines = {
+        a: makeMachine({ id: 'a', state: 'off', fMin: 10, fMax: 50 }),
+        b: makeMachine({ id: 'b', state: 'coolingdown', fMin: 10, fMax: 50 }),
+        c: makeMachine({ id: 'c', state: 'stopping', fMin: 10, fMax: 50 }),
+        d: makeMachine({ id: 'd', state: 'emergencystop', fMin: 10, fMax: 50 }),
+        e: makeMachine({ id: 'e', state: 'idle', fMin: 10, fMax: 50 }),
+    };
+    const combos = validPumpCombinations(machines, 30, baseCtx());
+    // Only "e" can be in a combination
+    for (const subset of combos) {
+        for (const id of subset) assert.equal(id, 'e');
+    }
+});
+
+test('checkSpecialCases: reduces Qd by flow of manually controlled operational machines', () => {
+    const machines = {
+        a: makeMachine({ id: 'a', state: 'operational', mode: 'virtualControl' }),
+        b: makeMachine({ id: 'b', state: 'idle' }),
+    };
+    const ctx = baseCtx({
+        readChildMeasurement: (m, type, variant) => {
+            if (m.config.general.id === 'a' && variant === 'measured') return 12;
+            return undefined;
+        },
+    });
+    const adjusted = checkSpecialCases(machines, 50, ctx);
+    assert.equal(adjusted, 38);
+});
+
+test('validPumpCombinations: no machines returns empty array', () => {
+    const combos = validPumpCombinations({}, 10, baseCtx());
+    assert.deepEqual(combos, []);
+});

test/basic/totalsCalculator.basic.test.js

@@ -0,0 +1,128 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const TotalsCalculator = require('../../src/totals/totalsCalculator');
+
+const unitPolicy = {
+    canonical: { pressure: 'Pa', flow: 'm3/s', power: 'W', temperature: 'K' },
+    output:    { pressure: 'Pa', flow: 'm3/s', power: 'W', temperature: 'K' },
+};
+const silent = { debug() {}, info() {}, warn() {}, error() {} };
+
+function predictView(min, max) {
+    return { currentF: (min + max) / 2, currentFxyYMin: min, currentFxyYMax: max };
+}
+
+function makeMachine(id, opts = {}) {
+    const {
+        flowMin = 0.0, flowMax = 1.0,
+        powerMin = 100, powerMax = 1000,
+        state = 'operational',
+        hasCurve = true,
+        NCog = 0.5,
+        // Input-curve envelope (for calcAbsoluteTotals): { [pressureKey]: { y: [...] } }
+        inputCurve = null,
+        actFlow = 0,
+        actPower = 0,
+    } = opts;
+
+    const fakeInput = inputCurve || {
+        '50000': { y: [flowMin, (flowMin + flowMax) / 2, flowMax] },
+    };
+    const fakePower = inputCurve
+        ? Object.fromEntries(Object.keys(inputCurve).map(k => [k, { y: [powerMin, (powerMin + powerMax) / 2, powerMax] }]))
+        : { '50000': { y: [powerMin, (powerMin + powerMax) / 2, powerMax] } };
+
+    return {
+        config: { general: { id } },
+        hasCurve,
+        state: { getCurrentState: () => state },
+        NCog,
+        predictFlow:  { inputCurve: fakeInput,  ...predictView(flowMin,  flowMax)  },
+        predictPower: { inputCurve: fakePower, ...predictView(powerMin, powerMax) },
+        _actFlow: actFlow,
+        _actPower: actPower,
+    };
+}
+
+function fakeOperatingPoint(/* machines */) {
+    return {
+        readChild(machine, type, _variant, _position /*, _unit */) {
+            if (type === 'flow')  return machine._actFlow;
+            if (type === 'power') return machine._actPower;
+            return null;
+        },
+    };
+}
+
+test('calcAbsoluteTotals returns zeros when no machines', () => {
+    const tc = new TotalsCalculator({ machines: {}, unitPolicy, logger: silent });
+    const t = tc.calcAbsoluteTotals();
+    assert.deepEqual(t, { flow: { min: 0, max: 0 }, power: { min: 0, max: 0 } });
+});
+
+test('calcAbsoluteTotals scans curve envelope (sum of maxes, min of mins)', () => {
+    const machines = {
+        a: makeMachine('a', { flowMin: 0.1, flowMax: 0.5, powerMin: 100, powerMax: 500 }),
+        b: makeMachine('b', { flowMin: 0.2, flowMax: 0.8, powerMin: 200, powerMax: 700 }),
+    };
+    const tc = new TotalsCalculator({ machines, unitPolicy, logger: silent });
+    const t = tc.calcAbsoluteTotals();
+    assert.equal(t.flow.min,  0.1);
+    assert.equal(t.power.min, 100);
+    // max is summed across all machines
+    assert.equal(t.flow.max,  0.5 + 0.8);
+    assert.equal(t.power.max, 500 + 700);
+});
+
+test('calcDynamicTotals sums across machines and skips machines with no valid curve', () => {
+    const machines = {
+        a: makeMachine('a', { flowMin: 0.1, flowMax: 0.5, powerMin: 100, powerMax: 500, actFlow: 0.3, actPower: 300 }),
+        b: makeMachine('b', { flowMin: 0.2, flowMax: 0.7, powerMin: 200, powerMax: 600, actFlow: 0.4, actPower: 400 }),
+        skip: makeMachine('skip', { hasCurve: false }),
+    };
+    const tc = new TotalsCalculator({
+        machines, unitPolicy, logger: silent,
+        operatingPoint: fakeOperatingPoint(machines),
+    });
+
+    const t = tc.calcDynamicTotals();
+
+    assert.equal(t.flow.min,  0.1);
+    assert.equal(t.flow.max,  0.5 + 0.7);
+    assert.equal(t.flow.act,  0.3 + 0.4);
+    assert.equal(t.power.min, 100);
+    assert.equal(t.power.max, 500 + 600);
+    assert.equal(t.power.act, 300 + 400);
+    assert.equal(t.NCog,      machines.a.NCog + machines.b.NCog);
+});
+
+test('activeTotals skips machines whose state is off or maintenance', () => {
+    const machines = {
+        a: makeMachine('a', { flowMin: 0.1, flowMax: 0.5, powerMin: 100, powerMax: 500, state: 'operational' }),
+        b: makeMachine('b', { flowMin: 0.2, flowMax: 0.7, powerMin: 200, powerMax: 600, state: 'off' }),
+        c: makeMachine('c', { flowMin: 0.3, flowMax: 0.9, powerMin: 300, powerMax: 900, state: 'maintenance' }),
+        d: makeMachine('d', { flowMin: 0.05, flowMax: 0.4, powerMin: 50, powerMax: 400, state: 'accelerating' }),
+    };
+    const tc = new TotalsCalculator({ machines, unitPolicy, logger: silent });
+
+    const t = tc.activeTotals();
+    assert.equal(t.countActiveMachines, 2); // a + d
+    assert.equal(t.flow.min,  0.1 + 0.05);
+    assert.equal(t.flow.max,  0.5 + 0.4);
+    assert.equal(t.power.min, 100 + 50);
+    assert.equal(t.power.max, 500 + 400);
+});
+
+test('activeTotals honours the injected isMachineActive override', () => {
+    const machines = {
+        a: makeMachine('a', { flowMin: 0.1, flowMax: 0.5, powerMin: 100, powerMax: 500, state: 'operational' }),
+        b: makeMachine('b', { flowMin: 0.2, flowMax: 0.7, powerMin: 200, powerMax: 600, state: 'operational' }),
+    };
+    const tc = new TotalsCalculator({
+        machines, unitPolicy, logger: silent,
+        isMachineActive: (id) => id === 'b',
+    });
+    const t = tc.activeTotals();
+    assert.equal(t.countActiveMachines, 1);
+    assert.equal(t.flow.max, 0.7);
+});

test/edge/structure-examples-node-type.edge.test.js

@@ -3,7 +3,7 @@ const assert = require('node:assert/strict');
 const fs = require('node:fs');
 const path = require('node:path');
 
-const flow = JSON.parse(fs.readFileSync(path.resolve(__dirname, '../../examples/basic.flow.json'), 'utf8'));
+const flow = JSON.parse(fs.readFileSync(path.resolve(__dirname, '../../examples/02-Dashboard.json'), 'utf8'));
 
 test('basic example includes node type machineGroupControl', () => {
   const count = flow.filter((n) => n && n.type === 'machineGroupControl').length;

test/integration/bep-distance-demand-sweep.integration.test.js

@@ -0,0 +1,138 @@
+// Empirical answer: does absDistFromPeak / relDistFromPeak move with demand?
+// Drives the live MGC + 3 identical pumps (same model as the dashboard demo)
+// across a demand sweep and records what each metric actually does. The test
+// asserts the expected qualitative shape, so any future change that
+// regresses BEP-distance sensitivity will fail loudly.
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const RM = require('../../../rotatingMachine/src/specificClass');
+const MGC = require('../../src/specificClass');
+const { getOutput } = require('../../src/io/output');
+
+const PUMP_MODEL = 'hidrostal-H05K-S03R';
+const HEADER_DP_MBAR = 1100;
+
+// stateConfig.time = 0 for every transition so warmup/cooldown don't add real
+// seconds — without this the 4-demand sweep × 3 pumps takes >120s and the test
+// runner kills it.
+const INSTANT_STATE = {
+  time: { starting: 0, warmingup: 0, operational: 0, accelerating: 0,
+          decelerating: 0, stopping: 0, coolingdown: 0, idle: 0,
+          maintenance: 0, emergencystop: 0, off: 0 },
+};
+
+function mkPump(id) {
+  return new RM({
+    general: { id, name: id },
+    asset:   { model: PUMP_MODEL, unit: 'm3/h' },
+  }, INSTANT_STATE);
+}
+
+async function buildGroupWithPressure() {
+  const mgc = new MGC({
+    general: { id: 'mgc', name: 'mgc' },
+    functionality: { mode: { current: 'optimalControl' }, positionVsParent: 'atEquipment' },
+  });
+  const pumps = ['A','B','C'].map(l => mkPump(`pump-${l}`));
+  for (const p of pumps) {
+    mgc.childRegistrationUtils?.registerChild?.(p, 'atEquipment');
+  }
+  for (const p of pumps) {
+    p.updateMeasuredPressure(0,                'upstream',   { timestamp: Date.now(), unit: 'mbar', childName: 'sim-up' });
+    p.updateMeasuredPressure(HEADER_DP_MBAR,   'downstream', { timestamp: Date.now(), unit: 'mbar', childName: 'sim-dn' });
+  }
+  // Let pressure events propagate through the emitter chain.
+  await new Promise(r => setTimeout(r, 50));
+  return { mgc, pumps };
+}
+
+// Settle to 'ready' between demands. The rendezvous lock defers a new setpoint
+// that arrives while the group is still 'working', so each sweep step must wait
+// for the previous move to land before issuing (and reading) the next.
+async function waitReady(mgc, timeoutMs = 6000) {
+  const t0 = Date.now();
+  while (Date.now() - t0 < timeoutMs) {
+    if (mgc.getMovementState?.() === 'ready') return true;
+    try { await mgc.movementExecutor?.tick?.(); } catch { /* ignore */ }
+    await new Promise(r => setTimeout(r, 40));
+  }
+  return false;
+}
+
+async function sweepDemand(mgc, demands_m3h) {
+  const rows = [];
+  for (const Qd_m3h of demands_m3h) {
+    const Qd = Qd_m3h / 3600; // m3/h → m3/s
+    try { await mgc.handleInput('parent', Qd); }
+    catch (e) { /* turnOff or no-combination paths are part of the contract */ }
+    await waitReady(mgc);
+    const out = getOutput(mgc);
+    rows.push({
+      demand: Qd_m3h,
+      flow: out.atEquipment_predicted_flow,
+      eta: out.atEquipment_predicted_efficiency,
+      absDist: out.absDistFromPeak,
+      relDist: out.relDistFromPeak,
+      ncog: out.atEquipment_predicted_Ncog,
+      nAct: out.machineCountActive,
+    });
+  }
+  return rows;
+}
+
+test('absDistFromPeak rises when demand pushes pumps off BEP', async () => {
+  const { mgc } = await buildGroupWithPressure();
+  // Sweep covers "comfortably within combined BEP" (low/mid) and "over the
+  // group's BEP envelope, pumps must push" (high). For hidrostal-H05K-S03R
+  // at 1100 mbar, single-pump max ≈ 230 m³/h, 3-pump max ≈ 680 m³/h. Demand
+  // 600 m³/h forces each pump well past BEP.
+  const rows = await sweepDemand(mgc, [100, 200, 300, 600]);
+
+  // Sanity: pumps actually accepted the demand and flow is rising.
+  assert.ok(rows[3].flow > rows[0].flow + 100,
+    `flow should rise with demand, got ${JSON.stringify(rows.map(r => r.flow))}`);
+
+  // absDist should be larger at over-capacity demand than at within-capacity.
+  // Use a generous tolerance — the test asserts the QUALITATIVE shape, not
+  // exact numbers (which depend on curve interpolation).
+  const lowAbs  = Math.min(rows[0].absDist, rows[1].absDist, rows[2].absDist);
+  const highAbs = rows[3].absDist;
+  assert.ok(highAbs > lowAbs + 0.005,
+    `absDistFromPeak should be larger off-BEP than on-BEP. ` +
+    `low (Qd∈{100,200,300}): min=${lowAbs}, high (Qd=600): ${highAbs}. ` +
+    `Full rows: ${JSON.stringify(rows, null, 2)}`);
+});
+
+test('absDistFromPeak ≈ 0 across the within-BEP demand range (working as designed)', async () => {
+  const { mgc } = await buildGroupWithPressure();
+  const rows = await sweepDemand(mgc, [100, 200, 300]);
+  // The BEP-Gravitation optimizer is supposed to KEEP us at BEP for demands
+  // the group can absorb at BEP. So absDist staying near zero across the
+  // "easy" range is the correct outcome — NOT a bug. This test pins that
+  // behaviour so any future "fix" that introduces drift here fails.
+  for (const r of rows) {
+    assert.ok(r.absDist != null && r.absDist < 0.02,
+      `at demand ${r.demand} m³/h, absDist=${r.absDist} should be near zero ` +
+      `(optimizer holds BEP); only off-BEP demand should produce noticeable drift`);
+  }
+});
+
+test('relDistFromPeak is structurally ill-defined for homogeneous pump groups', async () => {
+  const { mgc } = await buildGroupWithPressure();
+  const rows = await sweepDemand(mgc, [100, 200, 300, 600]);
+  // 3 identical pumps → all cogs equal → max=mean=min in calcDistanceBEP.
+  // The interpolation [max..min] → [0..1] collapses; the metric is
+  // mathematically undefined here. Whatever value comes out is float-noise
+  // dependent and MUST NOT be interpreted as "BEP distance percentage".
+  // This test documents the limitation as a contract; it deliberately does
+  // not assert a specific value — it asserts the metric does NOT move
+  // monotonically with demand (which it shouldn't for identical pumps).
+  const uniqueRel = new Set(rows.map(r => r.relDist));
+  assert.ok(uniqueRel.size <= 2,
+    `relDistFromPeak is expected to be effectively constant for identical pumps. ` +
+    `Distinct values across sweep: ${[...uniqueRel].join(', ')}. ` +
+    `If you want this metric to track demand, configure pumps with different ` +
+    `peak η (different models or different curve scaling).`);
+});

test/integration/dashboard-fanout.integration.test.js

@@ -0,0 +1,251 @@
+// Output-coverage tests for examples/02-Dashboard.json :: fn_status_split.
+// Exercises every output port in three states (deploy / post-setup / post-demand)
+// AND verifies the per-port format contract that every downstream ui-* widget
+// or chart expects. Per .claude/rules/output-coverage.md.
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const flow = JSON.parse(fs.readFileSync(
+  path.resolve(__dirname, '../../examples/02-Dashboard.json'), 'utf8'));
+const fn = flow.find(n => n.id === 'fn_status_split');
+
+function runFn(msgs) {
+  let ctxStore = {};
+  const context = {
+    get: (k) => ctxStore[k],
+    set: (k, v) => { ctxStore[k] = v; },
+  };
+  const fn_body = new Function('msg', 'context', fn.func);
+  return msgs.map(msg => fn_body(msg, context));
+}
+
+// Indices into the 18-output return array. Kept here as the manifest contract
+// for this function — every test below references these names, never raw ints.
+const PORT = {
+  text_mode: 0, text_flow: 1, text_power: 2, text_capacity: 3,
+  text_machines: 4, text_bep_rel: 5, text_eta: 6, text_eta_peak: 7,
+  text_bep_abs: 8, text_ncog: 9,
+  chart_flow: 10, chart_capacity: 11, chart_power: 12, chart_bep_rel: 13,
+  chart_eta: 14,
+  raw_rows: 15, raw_passthrough: 16,
+  chart_pctcap: 17,
+};
+
+const initialMsg = {
+  payload: {
+    mode: 'optimalControl', scaling: 'normalized',
+    absDistFromPeak: 0, relDistFromPeak: 0,
+    flowCapacityMax: 0, flowCapacityMin: 0,
+    machineCount: 3, machineCountActive: 0,
+  },
+};
+const postSetupMsg = {
+  payload: {
+    atEquipment_predicted_flow: 0, downstream_predicted_flow: 0,
+    atEquipment_predicted_power: 0,
+    flowCapacityMax: 450, flowCapacityMin: 0,
+    machineCountActive: 0,
+    headerDiffPa: 110000, headerDiffMbar: 1100,
+  },
+};
+const postDemandMsg = {
+  payload: {
+    atEquipment_predicted_flow: 200,
+    downstream_predicted_flow: 200,
+    atEquipment_predicted_power: 11.4,
+    atEquipment_predicted_efficiency: 0.62,
+    // Ncog as MGC actually emits it: SUM of per-pump NCog values.
+    // 2 pumps each at NCog=0.6 → sum=1.2; per-pump average should display as 60.0 %.
+    atEquipment_predicted_Ncog: 1.2,
+    absDistFromPeak: 0.05, relDistFromPeak: 0.08,
+    flowCapacityMax: 450, machineCountActive: 2,
+  },
+};
+
+test('manifest: function has exactly 18 outputs and wires array matches', () => {
+  assert.equal(fn.outputs, 18);
+  assert.equal(fn.wires.length, 18);
+});
+
+test('State A (deploy-time): no AT_EQUIPMENT keys → flow/power text show em-dash', () => {
+  const [out] = runFn([initialMsg]);
+  assert.equal(out[PORT.text_mode].payload, 'optimalControl');
+  assert.equal(out[PORT.text_flow].payload, '—');
+  assert.equal(out[PORT.text_power].payload, '—');
+  assert.equal(out[PORT.text_ncog].payload, '—');
+  assert.equal(out[PORT.text_eta].payload, '—');
+});
+
+test('State A: charts with no source data emit null msg, never { payload: null }', () => {
+  const [out] = runFn([initialMsg]);
+  // Charts 10, 12, 14 have no source data in State A → must be null (drop msg).
+  assert.equal(out[PORT.chart_flow], null, 'chart_flow must be null when flow missing');
+  assert.equal(out[PORT.chart_power], null, 'chart_power must be null when power missing');
+  assert.equal(out[PORT.chart_eta], null, 'chart_eta must be null when eta missing');
+  // For every msg-emitting chart output: payload is never literally null.
+  for (const idx of Object.values(PORT)) {
+    if (out[idx] && Object.prototype.hasOwnProperty.call(out[idx], 'payload')) {
+      assert.notEqual(out[idx].payload, null,
+        `port ${idx} emitted { payload: null } — would crash ui-chart`);
+    }
+  }
+});
+
+test('State B (post-setup, no demand): flow/power = 0, eta missing', () => {
+  const [, out] = runFn([initialMsg, postSetupMsg]);
+  assert.equal(out[PORT.text_flow].payload, '0.0 m³/h');
+  assert.equal(out[PORT.text_power].payload, '0.00 kW');
+  assert.equal(out[PORT.text_capacity].payload, '0.0 – 450.0 m³/h');
+  // η still missing → '—'
+  assert.equal(out[PORT.text_eta].payload, '—');
+});
+
+test('State C (post-demand): every text/chart output has real value', () => {
+  const [, , out] = runFn([initialMsg, postSetupMsg, postDemandMsg]);
+  assert.equal(out[PORT.text_flow].payload, '200.0 m³/h');
+  assert.equal(out[PORT.text_power].payload, '11.40 kW');
+  assert.equal(out[PORT.text_eta].payload, '62.0 %');
+  // BEP abs gap: η-points dimensionless, 3 dp.
+  assert.equal(out[PORT.text_bep_abs].payload, '0.050');
+  // Charts have numeric payload.
+  assert.equal(out[PORT.chart_flow].payload, 200);
+  assert.equal(out[PORT.chart_power].payload, 11.4);
+  assert.equal(out[PORT.chart_eta].payload, 62);
+  // % of capacity = flow / flowCapacityMax × 100 = 200 / 450 × 100 ≈ 44.44.
+  assert.equal(out[PORT.chart_pctcap].topic, '% of capacity');
+  assert.ok(Math.abs(out[PORT.chart_pctcap].payload - (200 / 450) * 100) < 1e-6);
+});
+
+test('% of capacity chart: drops msg when flow or capacity missing (no payload:null)', () => {
+  // State A: no flow + flowCapacityMax=0 → pctCap undefined → chart() returns
+  // null so the function node skips the output, never { payload: null }.
+  const [out] = runFn([initialMsg]);
+  assert.equal(out[PORT.chart_pctcap], null, 'chart_pctcap must drop msg when source missing');
+});
+
+test('NCog formatter: SUM is normalized by machineCountActive before display', () => {
+  // The fix under test. MGC emits Ncog as the SUM of per-pump NCog values
+  // (range 0..N), so a raw pct() would display 120% for 2 pumps at 0.6 each.
+  // The formatter must divide by machineCountActive first.
+  const [, , out] = runFn([initialMsg, postSetupMsg, postDemandMsg]);
+  // 2 pumps × 0.6 each = sum 1.2, mean 0.6, displayed "60.0 %".
+  assert.equal(out[PORT.text_ncog].payload, '60.0 %');
+});
+
+test('NCog formatter: ncogSum=0 with active pumps → 0.0 %, not em-dash', () => {
+  const msg = { payload: { ...postSetupMsg.payload,
+    atEquipment_predicted_Ncog: 0, machineCountActive: 3 } };
+  const [out] = runFn([msg]);
+  // Today this is exactly what the live MGC emits (per-pump groupNCog=0
+  // for the hidrostal-H05K-S03R curve at 110 kPa). The dashboard must show
+  // a clean "0.0 %" — not "—" — because we DO have data, it's just zero.
+  assert.equal(out[PORT.text_ncog].payload, '0.0 %');
+});
+
+test('NCog formatter: ncogSum present but machineCountActive = 0 → em-dash (no /0)', () => {
+  const msg = { payload: { atEquipment_predicted_Ncog: 1.5, machineCountActive: 0 } };
+  const [out] = runFn([msg]);
+  assert.equal(out[PORT.text_ncog].payload, '—');
+});
+
+test('NCog formatter: ncogSum present but machineCountActive missing → em-dash', () => {
+  const msg = { payload: { atEquipment_predicted_Ncog: 1.5 /* no nAct */ } };
+  const [out] = runFn([msg]);
+  assert.equal(out[PORT.text_ncog].payload, '—');
+});
+
+test('NCog formatter: 3 pumps each at NCog=0.5 (sum 1.5) → 50.0 %, not 150 %', () => {
+  // Regression test for the bug class — the formatter was displaying sum × 100,
+  // so 1.5 became "150.0 %". Verify the normalization sticks.
+  const msg = { payload: {
+    atEquipment_predicted_Ncog: 1.5,
+    machineCountActive: 3,
+  } };
+  const [out] = runFn([msg]);
+  assert.equal(out[PORT.text_ncog].payload, '50.0 %');
+});
+
+test('BEP rel%: undefined bepRel → "—" (degenerate homogeneous-pump case)', () => {
+  // After today's groupEfficiency fix, MGC emits relDistFromPeak=undefined when
+  // pumps are identical. The dashboard text formatter must display "—" — NOT
+  // "0.0 %" via the +null === 0 trap.
+  const msg = { payload: { mode: 'optimalControl', relDistFromPeak: undefined } };
+  const [out] = runFn([msg]);
+  assert.equal(out[PORT.text_bep_rel].payload, '—');
+});
+
+test('BEP rel%: null bepRel → "—" (defensive against null emission)', () => {
+  // Same trap as the NCog fix: +null === 0 → pct() would return "0.0 %".
+  const msg = { payload: { relDistFromPeak: null } };
+  const [out] = runFn([msg]);
+  assert.equal(out[PORT.text_bep_rel].payload, '—');
+});
+
+test('BEP rel% chart: drops msg when bepRel is null/undefined (no payload:null)', () => {
+  const msg = { payload: { relDistFromPeak: undefined } };
+  const [out] = runFn([msg]);
+  assert.equal(out[PORT.chart_bep_rel], null, 'chart must drop msg when bepRel missing');
+});
+
+// ── fn_qh_fanout: Q-H curve → chart points ────────────────────────────
+const fnQH = flow.find(n => n.id === 'fn_qh_fanout');
+
+function runFanout(payload) {
+  const fn_body = new Function('msg', fnQH.func);
+  return fn_body({ payload });
+}
+
+test('Q-H fanout: trims trailing flat-Q tail so chart axis doesn\'t blow up', () => {
+  // Synthetic input mimics buildQHCurve at low ctrl%: useful range followed by
+  // a horizontal tail (Q clamped to env minimum across high H).
+  const points = [
+    { Q: 100, H: 7 }, { Q: 80,  H: 10 }, { Q: 50, H: 15 },
+    { Q: 20,  H: 20 }, { Q: 9.5, H: 24 }, { Q: 9.5, H: 28 },
+    { Q: 9.5, H: 32 }, { Q: 9.5, H: 36 }, { Q: 9.5, H: 40 },
+  ];
+  const [out] = runFanout({ points });
+  const curvePoints = out.filter(m => m.topic === 'Curve' && m.payload);
+  // The 5 tail points at Q=9.5 should collapse to (at most) one — the first
+  // one to mark the curve's tail entry, not all five.
+  const tailPoints = curvePoints.filter(p => p.payload.Q === 9.5 || p.payload.x === 9.5);
+  assert.ok(tailPoints.length <= 1,
+    `expected ≤1 flat-tail point, got ${tailPoints.length}: ${JSON.stringify(curvePoints)}`);
+});
+
+test('Q-H fanout: still emits the rising portion of the curve unchanged', () => {
+  const points = [
+    { Q: 100, H: 7 }, { Q: 80,  H: 10 }, { Q: 50, H: 15 }, { Q: 20, H: 20 },
+    { Q: 9.5, H: 24 }, { Q: 9.5, H: 28 }, // flat tail
+  ];
+  const [out] = runFanout({ points });
+  const curvePoints = out.filter(m => m.topic === 'Curve' && m.payload);
+  const rising = curvePoints.filter(p => p.payload.x > 10);
+  assert.equal(rising.length, 4, `expected 4 rising points, got ${rising.length}`);
+  // First rising point preserves Q=100, H=7.
+  assert.equal(rising[0].payload.x, 100);
+  assert.equal(rising[0].payload.y, 7);
+});
+
+test('Q-H fanout: empty/error input → null msg', () => {
+  assert.equal(runFanout({ error: 'no curve', points: [] }), null);
+  assert.equal(runFanout({ points: [] }), null);
+});
+
+test('contract: no output ever emits { payload: null } for any of the three states', () => {
+  // The original η-null bug. Re-asserted across all three states because a
+  // regression here crashes the FlowFuse ui-chart with TypeError on .y.
+  const states = runFn([initialMsg, postSetupMsg, postDemandMsg]);
+  for (let s = 0; s < states.length; s++) {
+    const out = states[s];
+    for (let i = 0; i < out.length; i++) {
+      const msg = out[i];
+      if (msg && Object.prototype.hasOwnProperty.call(msg, 'payload')) {
+        assert.notEqual(msg.payload, null,
+          `state ${s} port ${i} → { payload: null } would crash ui-chart`);
+      }
+    }
+  }
+});

test/integration/demand-cycle-walkthrough.integration.test.js

@@ -49,7 +49,7 @@ function machineConfig(id) {
   return {
     general: { logging: logCfg, name: id, id, unit: 'm3/h' },
     functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
-    asset: { category: 'pump', type: 'centrifugal', model: 'hidrostal-H05K-S03R', supplier: 'hidrostal' },
+    asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
     mode: {
       current: 'auto',
       allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
@@ -67,8 +67,10 @@ function groupConfig() {
   return {
     general: { logging: logCfg, name: 'mgc', id: 'mgc' },
     functionality: { softwareType: 'machinegroup', role: 'groupcontroller', positionVsParent: 'atEquipment' },
-    scaling: { current: 'normalized' },         // demand expressed as 0..100 %
     mode:    { current: 'optimalcontrol' },     // production mode
+    // No scaling config: post-refactor MGC has no scaling state. handleInput
+    // takes canonical m³/s. Test converts pct → m³/s before dispatch (mirrors
+    // what the set.demand handler does for bare-number payloads).
   };
 }
 
@@ -159,24 +161,33 @@ test(`MGC demand-cycle walkthrough — head=${HEAD_MBAR} mbar, ${N_PUMPS} pumps,
   console.log(`MGC station envelope at head ${HEAD_MBAR} mbar (${N_PUMPS} pumps):`);
   console.log(`  per-pump: ${perPumpMin_m3h.toFixed(1)} .. ${perPumpMax_m3h.toFixed(1)} m³/h`);
   console.log(`  station: ${flowMin_m3h.toFixed(1)} .. ${flowMax_m3h.toFixed(1)} m³/h`);
-  console.log(`  scaling=normalized: 0% → ${flowMin_m3h.toFixed(1)} m³/h, 100% → ${flowMax_m3h.toFixed(1)} m³/h`);
-  console.log(`  (demand ≤ 0% turns ALL pumps off — see MGC handleInput)`);
+  console.log(`  0% → ${flowMin_m3h.toFixed(1)} m³/h, 100% → ${flowMax_m3h.toFixed(1)} m³/h`);
+  console.log(`  (demand < 0 turns ALL pumps off; 0 = minimum-control floor)`);
   console.log('');
   printHeader(pumps);
 
-  // Build demand sweep: 0..100% up, then 100..0% down.
+  // Build demand sweep: 0..100% up, then 100..0% down, then -1 (all-off sentinel).
   const upSteps = [];
   for (let pct = 0; pct <= 100 + 1e-9; pct += STEP_PERCENT) upSteps.push(Math.min(pct, 100));
   const downSteps = upSteps.slice(0, -1).reverse();         // skip the duplicate 100
-  const sequence = [...upSteps, ...downSteps];
+  const sequence = [...upSteps, ...downSteps, -1];
 
   let stuckSeen = 0;
   for (const pct of sequence) {
-    await mgc.handleInput('parent', pct);
+    // Post-refactor handleInput takes canonical m³/s; the percent → m³/s
+    // mapping the set.demand handler does is replicated here in test.
+    if (pct < 0) {
+      await mgc.turnOffAllMachines();
+    } else {
+      const flowMin_m3s = flowMin_m3h / 3600;
+      const flowMax_m3s = flowMax_m3h / 3600;
+      const canonical = flowMin_m3s + (pct / 100) * (flowMax_m3s - flowMin_m3s);
+      await mgc.handleInput('parent', canonical);
+    }
     await sleep(DWELL_MS);
 
-    // Mirror MGC's normalized→absolute mapping for the printed Qd column.
-    const demandQout_m3h = pct <= 0
+    // pct < 0 → all off (Qd = 0); pct >= 0 → linear interpolation across [min, max].
+    const demandQout_m3h = pct < 0
       ? 0
       : (flowMax_m3h - flowMin_m3h) * (pct / 100) + flowMin_m3h;
 
@@ -194,11 +205,11 @@ test(`MGC demand-cycle walkthrough — head=${HEAD_MBAR} mbar, ${N_PUMPS} pumps,
       if (s.state === 'accelerating' || s.state === 'decelerating') stuckSeen += 1;
     }
 
-    if (pct === 0) {
-      // Demand 0% must turn ALL pumps off (or to a non-running state).
+    if (pct < 0) {
+      // Strict negative demand turns ALL pumps off (the explicit "all off" signal).
       for (const s of snaps) {
         assert.ok(['idle', 'off', 'stopping', 'coolingdown'].includes(s.state),
-          `demand 0% but pump still in '${s.state}' (totalQ=${totalQ.toFixed(2)})`);
+          `demand ${pct}% but pump still in '${s.state}' (totalQ=${totalQ.toFixed(2)})`);
       }
     }
   }

test/integration/distribution-power-table.integration.test.js

@@ -26,7 +26,7 @@ function machineConfig(id, model) {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name: id, id, unit: 'm3/h' },
     functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
-    asset: { category: 'pump', type: 'centrifugal', model, supplier: 'hidrostal' },
+    asset: { model, unit: 'm3/h' },
     mode: {
       current: 'auto',
       allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
@@ -44,7 +44,7 @@ function groupConfig() {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name: 'station' },
     functionality: { softwareType: 'machinegroup', role: 'groupcontroller' },
-    scaling: { current: 'absolute' },
+    // No scaling field — handleInput always takes canonical m³/s post-refactor.
     mode: { current: 'optimalcontrol' }
   };
 }
@@ -139,7 +139,6 @@ test('machineGroupControl vs naive baselines — real curves, verified flow', as
 
     // Run machineGroupControl optimalControl with absolute scaling
     mg.setMode('optimalcontrol');
-    mg.setScaling('absolute');
     mg.calcAbsoluteTotals();
     mg.calcDynamicTotals();
     await mg.handleInput('parent', Qd);
@@ -196,7 +195,6 @@ test('machineGroupControl vs naive baselines — real curves, verified flow', as
       injectPressure(m);
     }
     mg.setMode('optimalcontrol');
-    mg.setScaling('absolute');
     mg.calcAbsoluteTotals();
     mg.calcDynamicTotals();
     await mg.handleInput('parent', Qd);

test/integration/group-bep-cascade.integration.test.js

@@ -0,0 +1,93 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MachineGroup = require('../../src/specificClass');
+const Machine = require('../../../rotatingMachine/src/specificClass');
+const baseCurve = require('../../../generalFunctions/datasets/assetData/curves/hidrostal-H05K-S03R.json');
+
+/**
+ * After fixing rotatingMachine + MGC to use hydraulic efficiency
+ * (η = Q·ΔP / P_shaft) instead of raw flow/power, every BEP-related output
+ * on MGC should be in the dimensionless 0..1 range and respond to demand
+ * changes. This check ties the whole chain together:
+ *   - per-machine cog updates after equalize
+ *   - group efficiency measurement is hydraulic (matches scale of cogs)
+ *   - calcDistanceBEP(eff, mean(cog), min(cog)) is non-degenerate
+ */
+
+const stateConfig = {
+    time: { starting: 0, warmingup: 0, stopping: 0, coolingdown: 0 },
+    movement: { speed: 1200, mode: 'staticspeed', maxSpeed: 1800 },
+};
+
+function machineConfig(id, label) {
+    return {
+        general: { logging: { enabled: false, logLevel: 'error' }, name: label, id, unit: 'm3/h' },
+        functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
+        asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
+        mode: {
+            current: 'auto',
+            allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
+            allowedSources: { auto: ['parent', 'GUI'] },
+        },
+        sequences: {
+            startup: ['starting', 'warmingup', 'operational'],
+            shutdown: ['stopping', 'coolingdown', 'idle'],
+            emergencystop: ['emergencystop', 'off'],
+        },
+    };
+}
+
+function groupConfig() {
+    return {
+        general: { logging: { enabled: false, logLevel: 'error' }, name: 'TestGroup' },
+        functionality: { softwareType: 'machinegroup', role: 'groupcontroller' },
+        mode: { current: 'optimalcontrol' },
+    };
+}
+
+async function setupGroupWithTwoPumps() {
+    const m1 = new Machine(machineConfig(1, 'pump-1'), stateConfig);
+    const m2 = new Machine(machineConfig(2, 'pump-2'), stateConfig);
+    m1.config.asset.machineCurve = baseCurve;
+    m2.config.asset.machineCurve = baseCurve;
+    await m1.handleInput('parent', 'execSequence', 'startup');
+    await m2.handleInput('parent', 'execSequence', 'startup');
+
+    const mgc = new MachineGroup(groupConfig(), stateConfig);
+    // Mutate the existing machines object — replacing the reference would
+    // strand operatingPoint/totals/efficiency on the original empty bag.
+    mgc.machines[1] = m1;
+    mgc.machines[2] = m2;
+    // Set header (system) pressure differential: 800/1200 mbar => 400 mbar = 40 kPa
+    mgc.measurements.type('pressure').variant('measured').position('upstream').value(80000, Date.now(), 'Pa');
+    mgc.measurements.type('pressure').variant('measured').position('downstream').value(120000, Date.now(), 'Pa');
+    mgc.operatingPoint.equalize();
+    return { mgc, m1, m2 };
+}
+
+test('after equalize, each child cog is a dimensionless 0..1 hydraulic efficiency', async () => {
+    const { m1, m2 } = await setupGroupWithTwoPumps();
+    // Trigger updatePosition by setting ctrl explicitly
+    m1.updatePosition();
+    m2.updatePosition();
+    for (const m of [m1, m2]) {
+        assert.ok(Number.isFinite(m.cog), `cog must be finite, got ${m.cog}`);
+        assert.ok(m.cog >= 0 && m.cog <= 1.0,
+            `cog must be a 0..1 hydraulic efficiency, got ${m.cog}`);
+    }
+});
+
+test('operatingPoint.headerDiffPa is set by equalize and matches measured differential', async () => {
+    const { mgc, m1 } = await setupGroupWithTwoPumps();
+    // Equalize reads from host measurements; falls back to children when
+    // header is missing. Either path should produce headerDiffPa > 0.
+    // headerDiff must equal the measured differential (40 kPa) once any
+    // pressure source is populated.
+    assert.equal(mgc.operatingPoint.headerDiffPa, 40000,
+        `headerDiffPa should equal downstream-upstream = 40000 Pa, got ${mgc.operatingPoint.headerDiffPa}`);
+    // Sanity: the host's child reference is still consumable for diagnostics.
+    void m1.measurements;
+});

test/integration/idle-startup-deadlock.integration.test.js

@@ -39,7 +39,7 @@ function machineConfig(id) {
   return {
     general: { logging: logCfg, name: id, id, unit: 'm3/h' },
     functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
-    asset: { category: 'pump', type: 'centrifugal', model: 'hidrostal-H05K-S03R', supplier: 'hidrostal' },
+    asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
     mode: {
       current: 'auto',
       allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
@@ -57,11 +57,20 @@ function groupConfig() {
   return {
     general: { logging: logCfg, name: 'mgc', id: 'mgc' },
     functionality: { softwareType: 'machinegroup', role: 'groupcontroller', positionVsParent: 'atEquipment' },
-    scaling: { current: 'normalized' },
     mode:    { current: 'optimalcontrol' },
   };
 }
 
+// Post-refactor handleInput takes canonical m³/s. This helper mirrors what
+// the set.demand handler does for a bare-number (percent) payload, so test
+// scenarios that previously sent `mgc.handleInput('parent', pctToCanonical(mgc, 100))` (= 100 %)
+// keep their intent.
+function pctToCanonical(mgc, pct) {
+  if (pct < 0) return -1;
+  const dt = mgc.calcDynamicTotals();
+  return mgc.interpolation.interpolate_lin_single_point(pct, 0, 100, dt.flow.min, dt.flow.max);
+}
+
 function buildGroup({ withPressure = true } = {}) {
   const mgc = new MachineGroup(groupConfig());
   const ids = Array.from({ length: N_PUMPS }, (_, i) => `pump_${String.fromCharCode(97 + i)}`);
@@ -137,7 +146,7 @@ test('Scenario 1 — single-shot 100% demand to idle pumps', async () => {
   console.log(`\n[Scenario 1] head=${HEAD_MBAR_DOWN} mbar, time.starting=${stateConfig.time.starting}s, time.warmingup=${stateConfig.time.warmingup}s`);
   printSnapshots('before handleInput', pumps);
 
-  await mgc.handleInput('parent', 100);
+  await mgc.handleInput('parent', pctToCanonical(mgc, 100));
   printSnapshots('immediately after handleInput returns', pumps);
 
   // Wait for full startup (3s) + movement (~0.5s) + slack
@@ -159,16 +168,16 @@ test('Scenario 2 — rapid 100% retargeting during startup window', async () =>
   // mid-flight, parking it in 'accelerating'/'decelerating'.
 
   const { mgc, pumps } = buildGroup();
-  console.log(`\n[Scenario 2] firing mgc.handleInput('parent', 100) every 200ms for 5s`);
+  console.log(`\n[Scenario 2] firing mgc.handleInput('parent', pctToCanonical(mgc, 100)) every 200ms for 5s`);
   printSnapshots('before any handleInput', pumps);
 
   // First call (kicks off startup); not awaited so retargets can layer on.
-  mgc.handleInput('parent', 100).catch(e => console.log(`first call rejected: ${e.message}`));
+  mgc.handleInput('parent', pctToCanonical(mgc, 100)).catch(e => console.log(`first call rejected: ${e.message}`));
 
   // Spam additional retargets every 200ms for 5s — covers the 3s startup
   // window with 25 extra retargeting calls.
   const interval = setInterval(() => {
-    mgc.handleInput('parent', 100).catch(e => console.log(`retarget rejected: ${e.message}`));
+    mgc.handleInput('parent', pctToCanonical(mgc, 100)).catch(e => console.log(`retarget rejected: ${e.message}`));
   }, 200);
   await sleep(5000);
   clearInterval(interval);
@@ -199,7 +208,7 @@ test('Scenario 3 — pumps with NO pressure measurements injected', async () =>
   console.log(`\n[Scenario 3] no pressure injected. per-pump curve envelope: ${minQ.toFixed(1)} .. ${maxQ.toFixed(1)} m³/h, station: ${(dyn.flow.min*3600).toFixed(1)} .. ${(dyn.flow.max*3600).toFixed(1)} m³/h`);
   printSnapshots('before handleInput', pumps);
 
-  await mgc.handleInput('parent', 100);
+  await mgc.handleInput('parent', pctToCanonical(mgc, 100));
   await sleep(6000);
   printSnapshots('after 6s settle (no pressure)', pumps);
 
@@ -228,7 +237,7 @@ test('Scenario 5 — full up/down/up cycle through shutdown', async () => {
   printSnapshots('before any handleInput', pumps);
 
   // Phase 1: drive up to 100% from idle.
-  await mgc.handleInput('parent', 100);
+  await mgc.handleInput('parent', pctToCanonical(mgc, 100));
   await sleep(5000); // full startup + ramp
   printSnapshots('after settle at 100%', pumps);
   for (const p of pumps) {
@@ -236,12 +245,14 @@ test('Scenario 5 — full up/down/up cycle through shutdown', async () => {
       `Phase 1: pump ${p.config.general.id} not operational at 100% (got ${p.state.getCurrentState()})`);
   }
 
-  // Phase 2: demand drops to 0% — pumps begin shutdown sequence.
-  // FIRE-AND-FORGET: handleInput(0) awaits turnOffAllMachines which
+  // Phase 2: demand drops below 0 — pumps begin shutdown sequence. Use a
+  // strictly-negative percent because 0% now means "minimum-control"
+  // (interpolates to dt.flow.min), not shutdown.
+  // FIRE-AND-FORGET: handleInput(-1) awaits turnOffAllMachines which
   // awaits the full per-pump shutdown sequence. We need the next 100%
   // demand to arrive WHILE pumps are still in stopping/coolingdown,
   // not after they've reached idle.
-  mgc.handleInput('parent', 0).catch(e => console.log(`0% rejected: ${e.message}`));
+  mgc.turnOffAllMachines().catch(e => console.log(`-1% rejected: ${e.message}`));
   // Wait briefly so the shutdown sequence enters but does NOT complete.
   // shutdown=['stopping','coolingdown','idle'] with stopping=1s,
   // coolingdown=2s. 500ms puts us solidly inside 'stopping'.
@@ -252,7 +263,7 @@ test('Scenario 5 — full up/down/up cycle through shutdown', async () => {
   console.log(`  states mid-shutdown: ${midShutdownStates.join(', ')}`);
 
   // Phase 3: demand returns to 100% while pumps are mid-shutdown.
-  await mgc.handleInput('parent', 100);
+  await mgc.handleInput('parent', pctToCanonical(mgc, 100));
   // Generous: full coolingdown remaining + full startup + ramp.
   await sleep(8000);
   printSnapshots('after re-engage to 100%', pumps);
@@ -279,7 +290,7 @@ test('Scenario 6 — full up sweep then full down sweep', async () => {
 
   console.log('  --- up sweep ---');
   for (const pct of upSteps) {
-    mgc.handleInput('parent', pct).catch(e => console.log(`up ${pct}% rejected: ${e.message}`));
+    mgc.handleInput('parent', pctToCanonical(mgc, pct)).catch(e => console.log(`up ${pct}% rejected: ${e.message}`));
     await sleep(600);
     const snaps = pumps.map(snapshot);
     const totalQ = snaps.reduce((s, x) => s + x.flow, 0);
@@ -291,7 +302,7 @@ test('Scenario 6 — full up sweep then full down sweep', async () => {
 
   console.log('  --- down sweep ---');
   for (const pct of downSteps) {
-    mgc.handleInput('parent', pct).catch(e => console.log(`down ${pct}% rejected: ${e.message}`));
+    mgc.handleInput('parent', pctToCanonical(mgc, pct)).catch(e => console.log(`down ${pct}% rejected: ${e.message}`));
     await sleep(600);
     const snaps = pumps.map(snapshot);
     const totalQ = snaps.reduce((s, x) => s + x.flow, 0);
@@ -340,7 +351,7 @@ test('Scenario 4 — varying demand during startup (combo flips)', async () => {
 
   for (const pct of sequence) {
     console.log(`  → demand ${pct}%`);
-    mgc.handleInput('parent', pct).catch(e => console.log(`call ${pct}% rejected: ${e.message}`));
+    mgc.handleInput('parent', pctToCanonical(mgc, pct)).catch(e => console.log(`call ${pct}% rejected: ${e.message}`));
     await sleep(400);
   }
 

test/integration/ncog-distribution.integration.test.js

@@ -27,6 +27,19 @@ const baseCurve = require('../../../generalFunctions/datasets/assetData/curves/h
 
 /* ---- helpers ---- */
 
+// Settle the group to 'ready'. The rendezvous lock defers a setpoint arriving
+// while the group is still 'working', so a full-MGC test must wait for each
+// move to land before reading steady state or issuing the next demand.
+async function waitReady(mgc, timeoutMs = 6000) {
+  const t0 = Date.now();
+  while (Date.now() - t0 < timeoutMs) {
+    if (mgc.getMovementState?.() === 'ready') return true;
+    try { await mgc.movementExecutor?.tick?.(); } catch { /* ignore */ }
+    await new Promise(r => setTimeout(r, 40));
+  }
+  return false;
+}
+
 function deepClone(obj) { return JSON.parse(JSON.stringify(obj)); }
 
 function distortSeries(series, scale = 1, tilt = 0) {
@@ -54,7 +67,7 @@ function createMachineConfig(id, label) {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name: label, id, unit: 'm3/h' },
     functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
-    asset: { category: 'pump', type: 'centrifugal', model: 'hidrostal-H05K-S03R', supplier: 'hidrostal' },
+    asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
     mode: {
       current: 'auto',
       allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
@@ -72,7 +85,6 @@ function createGroupConfig(name) {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name },
     functionality: { softwareType: 'machinegroup', role: 'groupcontroller' },
-    scaling: { current: 'normalized' },
     mode: { current: 'optimalcontrol' }
   };
 }
@@ -407,10 +419,15 @@ test('full MGC optimalControl uses ≤ power than priorityControl for mixed pump
     await m.handleInput('parent', 'execSequence', 'startup');
   }
 
-  // Run optimalControl
+  // Run optimalControl. handleInput takes canonical m³/s post-refactor —
+  // mirror the set.demand handler's percent → canonical mapping inline.
   mg.setMode('optimalcontrol');
-  mg.setScaling('normalized');
-  await mg.handleInput('parent', 50, Infinity);
+  function pctCanonical(mgc, pct) {
+    const dt = mgc.calcDynamicTotals();
+    return mgc.interpolation.interpolate_lin_single_point(pct, 0, 100, dt.flow.min, dt.flow.max);
+  }
+  await mg.handleInput('parent', pctCanonical(mg, 50), Infinity);
+  await waitReady(mg); // rendezvous lock — let the move land before reading steady state
   const optPower = mg.measurements.type('power').variant('predicted').position('atequipment').getCurrentValue() || 0;
   const optFlow = mg.measurements.type('flow').variant('predicted').position('atequipment').getCurrentValue() || 0;
 
@@ -419,10 +436,12 @@ test('full MGC optimalControl uses ≤ power than priorityControl for mixed pump
     await m.handleInput('parent', 'execSequence', 'shutdown');
     await m.handleInput('parent', 'execSequence', 'startup');
   }
+  await waitReady(mg); // ensure the group is settled so the next demand isn't deferred
 
   // Run priorityControl
   mg.setMode('prioritycontrol');
-  await mg.handleInput('parent', 50, Infinity, ['eff', 'std', 'weak']);
+  await mg.handleInput('parent', pctCanonical(mg, 50), Infinity, ['eff', 'std', 'weak']);
+  await waitReady(mg);
   const prioPower = mg.measurements.type('power').variant('predicted').position('atequipment').getCurrentValue() || 0;
   const prioFlow = mg.measurements.type('flow').variant('predicted').position('atequipment').getCurrentValue() || 0;
 

test/integration/optimizer-combination-choice.integration.test.js

@@ -28,7 +28,7 @@ function machineConfig(id) {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name: id, id, unit: 'm3/h' },
     functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
-    asset: { category: 'pump', type: 'centrifugal', model: 'hidrostal-H05K-S03R', supplier: 'hidrostal' },
+    asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
     mode: {
       current: 'auto',
       allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
@@ -46,7 +46,6 @@ function groupConfig() {
   return {
     general: { logging: { enabled: false, logLevel: 'error' }, name: 'mgc', id: 'mgc' },
     functionality: { softwareType: 'machinegroup', role: 'groupcontroller', positionVsParent: 'atEquipment' },
-    scaling: { current: 'absolute' },     // talk to MGC in m³/h directly
     mode: { current: 'optimalcontrol' },
   };
 }

test/integration/per-pump-ctrl-fanout.integration.test.js

@@ -0,0 +1,117 @@
+// Output-coverage tests for examples/02-Dashboard.json :: fn_chart_pump_a/b/c.
+// These per-pump fan-out functions feed two charts:
+//   output 0 → ui_chart_per_pump_flow  (topic = 'Pump A/B/C', payload = flow m³/h)
+//   output 1 → ui_chart_pumps_ctrl     (topic = 'Pump A/B/C', payload = ctrl %)
+// The ctrl output carries a -1 OFF sentinel: when the pump is off / idle /
+// maintenance it is not running, so we plot -1 (below the 0–100 band) to give
+// the chart a clear OFF rail distinct from a pump genuinely running at 0%.
+// Every output is exercised in populated AND degraded states per
+// .claude/rules/output-coverage.md.
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const flow = JSON.parse(fs.readFileSync(
+  path.resolve(__dirname, '../../examples/02-Dashboard.json'), 'utf8'));
+
+const PUMPS = [
+  { id: 'fn_chart_pump_a', topic: 'Pump A' },
+  { id: 'fn_chart_pump_b', topic: 'Pump B' },
+  { id: 'fn_chart_pump_c', topic: 'Pump C' },
+];
+
+const FLOW = 0; // output index → ui_chart_per_pump_flow
+const CTRL = 1; // output index → ui_chart_pumps_ctrl
+
+// Each fan-out caches Port 0 deltas in context('c'). Build a fresh runner per
+// test so state never leaks between cases.
+function makeRunner(node) {
+  let store = {};
+  const context = { get: (k) => store[k], set: (k, v) => { store[k] = v; } };
+  const body = new Function('msg', 'context', node.func);
+  return (payload) => body({ payload }, context);
+}
+
+// A populated downstream-flow key uses the 4-segment MeasurementContainer
+// convention the function matches with find('flow.predicted.downstream.').
+const flowKey = (id) => `flow.predicted.downstream.${id}`;
+
+test('every per-pump fan-out has exactly 2 outputs wired to flow + ctrl charts', () => {
+  for (const { id } of PUMPS) {
+    const node = flow.find(n => n.id === id);
+    assert.ok(node, `${id} present in flow`);
+    assert.equal(node.outputs, 2, `${id} outputs`);
+    assert.equal(node.wires.length, 2, `${id} wires`);
+    assert.deepEqual(node.wires[FLOW], ['ui_chart_per_pump_flow'], `${id} flow wire`);
+    assert.deepEqual(node.wires[CTRL], ['ui_chart_pumps_ctrl'], `${id} ctrl wire`);
+  }
+});
+
+test('ui_chart_pumps_ctrl ymin is -5 so the OFF sentinel (-1) is visible', () => {
+  const chart = flow.find(n => n.id === 'ui_chart_pumps_ctrl');
+  assert.ok(chart, 'ui_chart_pumps_ctrl present');
+  assert.equal(chart.ymin, '-5');
+  assert.equal(chart.ymax, '100');
+});
+
+for (const { id, topic } of PUMPS) {
+  test(`${id}: populated running state → flow + ctrl carry real numbers`, () => {
+    const run = makeRunner(flow.find(n => n.id === id));
+    const out = run({ [flowKey(id)]: 478 / 3, ctrl: 72, state: 'operational' });
+    assert.deepEqual(out[FLOW], { topic, payload: 478 / 3 });
+    assert.deepEqual(out[CTRL], { topic, payload: 72 });
+  });
+
+  for (const offState of ['off', 'idle', 'maintenance']) {
+    test(`${id}: state '${offState}' → ctrl emits -1 sentinel (even if ctrl% is 0/stale)`, () => {
+      const run = makeRunner(flow.find(n => n.id === id));
+      // ctrl stale at 0 (or any residual) must be overridden by the sentinel.
+      const out = run({ [flowKey(id)]: 0, ctrl: 0, state: offState });
+      assert.deepEqual(out[CTRL], { topic, payload: -1 });
+    });
+  }
+
+  test(`${id}: degraded — no state, ctrl missing → ctrl output is null (drop, never payload:null)`, () => {
+    const run = makeRunner(flow.find(n => n.id === id));
+    const out = run({ [flowKey(id)]: 50 });
+    assert.equal(out[CTRL], null, 'ctrl must drop when no state and no ctrl');
+    // flow still present.
+    assert.deepEqual(out[FLOW], { topic, payload: 50 });
+  });
+
+  test(`${id}: degraded — no flow key → flow output is null (drop)`, () => {
+    const run = makeRunner(flow.find(n => n.id === id));
+    const out = run({ ctrl: 40, state: 'operational' });
+    assert.equal(out[FLOW], null, 'flow must drop when source key missing');
+    assert.deepEqual(out[CTRL], { topic, payload: 40 });
+  });
+
+  test(`${id}: pre-first-tick — empty payload → both outputs null, no payload:null`, () => {
+    const run = makeRunner(flow.find(n => n.id === id));
+    const out = run({});
+    assert.equal(out[FLOW], null);
+    assert.equal(out[CTRL], null);
+    for (const m of out) {
+      if (m && Object.prototype.hasOwnProperty.call(m, 'payload')) {
+        assert.notEqual(m.payload, null, `${id} emitted { payload: null }`);
+      }
+    }
+  });
+
+  test(`${id}: running ctrl with NaN/null ctrl value → ctrl drops (no payload:null)`, () => {
+    const run = makeRunner(flow.find(n => n.id === id));
+    assert.equal(run({ [flowKey(id)]: 10, ctrl: null, state: 'operational' })[CTRL], null);
+    assert.equal(run({ [flowKey(id)]: 10, ctrl: NaN, state: 'operational' })[CTRL], null);
+  });
+
+  test(`${id}: delta-cache holds last state so a ctrl-only delta still rails OFF`, () => {
+    // Realistic: pump first reports state:'off', then a later tick carries only
+    // a ctrl delta (no state). The cached 'off' must keep the sentinel engaged.
+    const run = makeRunner(flow.find(n => n.id === id));
+    run({ state: 'off', ctrl: 0 });
+    const out = run({ ctrl: 5 }); // ctrl-only delta; cached state still 'off'
+    assert.deepEqual(out[CTRL], { topic, payload: -1 });
+  });
+}

test/integration/planner-convergence.integration.test.js

@@ -0,0 +1,254 @@
+// MGC planner — real-time CONVERGENCE diagnostic.
+//
+// Where planner-rendezvous.integration.test.js intercepts _fireCommand to
+// only assert schedule SHAPE, this test lets the executor REALLY run on
+// real pumps with non-zero startup/warmup times, and asks two questions:
+//
+//   (a) does sum-of-pump-flows converge to the demand setpoint?
+//   (b) do all pumps reach their individual flow target at roughly the
+//       same wall-clock instant (the rendezvous)?
+//
+// Realistic scenario: ONE pump already operational, TWO pumps idle. A new
+// demand requires (i) the two idle pumps to start (slow, ~3.5s) AND (ii)
+// the running pump to retarget. Per the planner code, only flow-DECREASING
+// moves get delayed to land at t*; flow-INCREASING moves on running pumps
+// fire at tick 0 and land at their own eta. So the running pump's landing
+// time should NOT match the two idle pumps unless its target equals its
+// current flow (an unusual coincidence). This test surfaces that.
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MachineGroup = require('../../src/specificClass');
+const Machine = require('../../../rotatingMachine/src/specificClass');
+
+const HEAD_MBAR_UP = 0;
+const HEAD_MBAR_DOWN = 1100;
+const N_PUMPS = 3;
+
+const LOG_DEBUG = process.env.LOG_DEBUG === '1';
+const logCfg = { enabled: LOG_DEBUG, logLevel: LOG_DEBUG ? 'debug' : 'error' };
+
+const stateConfig = {
+    general: { logging: logCfg },
+    state: { current: 'idle' },
+    movement: { mode: 'staticspeed', speed: 200, maxSpeed: 200, interval: 50 },
+    // REAL ladder times — this is the whole point of the test.
+    time: { starting: 1, warmingup: 2, stopping: 1, coolingdown: 2 },
+};
+
+function machineConfig(id) {
+    return {
+        general: { logging: logCfg, name: id, id, unit: 'm3/h' },
+        functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
+        asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
+        mode: {
+            current: 'auto',
+            allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
+            allowedSources: { auto: ['parent', 'GUI'] },
+        },
+        sequences: {
+            startup:       ['starting', 'warmingup', 'operational'],
+            shutdown:      ['stopping', 'coolingdown', 'idle'],
+            emergencystop: ['emergencystop', 'off'],
+        },
+    };
+}
+
+function groupConfig() {
+    return {
+        general: { logging: logCfg, name: 'mgc', id: 'mgc' },
+        functionality: { softwareType: 'machinegroup', role: 'groupcontroller', positionVsParent: 'atEquipment' },
+        mode: { current: 'optimalcontrol' },
+    };
+}
+
+function pctToCanonical(mgc, pct) {
+    if (pct < 0) return -1;
+    const dt = mgc.calcDynamicTotals();
+    return mgc.interpolation.interpolate_lin_single_point(pct, 0, 100, dt.flow.min, dt.flow.max);
+}
+
+const NON_RUNNING = new Set(['idle', 'off', 'stopping', 'coolingdown', 'emergencystop']);
+function pumpFlow_m3h(pump) {
+    const state = pump.state.getCurrentState();
+    if (NON_RUNNING.has(state)) return 0;
+    return Number(pump.predictFlow?.outputY ?? 0) * 3600;
+}
+
+function buildGroup() {
+    const mgc = new MachineGroup(groupConfig());
+    const ids = Array.from({ length: N_PUMPS }, (_, i) => `pump_${String.fromCharCode(97 + i)}`);
+    const pumps = ids.map((id) => new Machine(machineConfig(id), stateConfig));
+    for (const m of pumps) {
+        m.updateMeasuredPressure(HEAD_MBAR_UP,   'upstream',   { timestamp: Date.now(), unit: 'mbar', childName: 'up', childId: `up-${m.config.general.id}` });
+        m.updateMeasuredPressure(HEAD_MBAR_DOWN, 'downstream', { timestamp: Date.now(), unit: 'mbar', childName: 'dn', childId: `dn-${m.config.general.id}` });
+        mgc.childRegistrationUtils.registerChild(m, 'downstream');
+    }
+    mgc.calcAbsoluteTotals();
+    mgc.calcDynamicTotals();
+    return { mgc, pumps };
+}
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+// Sample per-pump flow at fixed intervals and return a trajectory: an array
+// of {tMs, perPump:[...], sum}.
+async function sampleFlows(pumps, durationMs, intervalMs = 200) {
+    const t0 = Date.now();
+    const out = [];
+    while (Date.now() - t0 < durationMs) {
+        const perPump = pumps.map(pumpFlow_m3h);
+        out.push({ tMs: Date.now() - t0, perPump, sum: perPump.reduce((a, b) => a + b, 0) });
+        await sleep(intervalMs);
+    }
+    return out;
+}
+
+// Find the wall-clock instant (in ms from t0) at which a given series
+// REACHES and STAYS within `tol` of `target` for the rest of the run. If
+// never reached, returns null.
+function arrivalTimeMs(series, target, tol) {
+    for (let i = 0; i < series.length; i++) {
+        const v = series[i];
+        if (Math.abs(v - target) <= tol) {
+            // require it to stay close
+            let stayed = true;
+            for (let j = i + 1; j < series.length; j++) {
+                if (Math.abs(series[j] - target) > tol * 1.5) { stayed = false; break; }
+            }
+            if (stayed) return i;
+        }
+    }
+    return null;
+}
+
+function printTrace(label, traj, demand_m3h) {
+    console.log(`\n${label}  (demand=${demand_m3h.toFixed(1)} m³/h)`);
+    const head = ['  t(s)'.padStart(7), 'pump_a'.padStart(8), 'pump_b'.padStart(8), 'pump_c'.padStart(8), 'Σ m³/h'.padStart(8), 'err'.padStart(7)];
+    console.log(head.join(' '));
+    console.log('─'.repeat(head.join(' ').length));
+    for (const s of traj) {
+        const err = s.sum - demand_m3h;
+        console.log([
+            (s.tMs / 1000).toFixed(2).padStart(7),
+            s.perPump[0].toFixed(1).padStart(8),
+            s.perPump[1].toFixed(1).padStart(8),
+            s.perPump[2].toFixed(1).padStart(8),
+            s.sum.toFixed(1).padStart(8),
+            err.toFixed(1).padStart(7),
+        ].join(' '));
+    }
+}
+
+// ── The diagnostic ──────────────────────────────────────────────────────
+
+test('planner-convergence: mixed-state dispatch — sum reaches demand AND lands together', async () => {
+    const { mgc, pumps } = buildGroup();
+    const dyn = mgc.calcDynamicTotals();
+    const flowMin_m3h = dyn.flow.min * 3600;
+    const flowMax_m3h = dyn.flow.max * 3600;
+    console.log(`\nStation envelope at head ${HEAD_MBAR_DOWN} mbar (${N_PUMPS} pumps): ${flowMin_m3h.toFixed(1)} .. ${flowMax_m3h.toFixed(1)} m³/h`);
+
+    // Phase 1: bring pump_a (only) to operational at a low setpoint via a
+    // direct child command. This bypasses the optimizer and gives us a
+    // deterministic mixed state: 1 running, 2 idle. We then drive a global
+    // demand to ramp up — the planner must coordinate one in-flight retarget
+    // with two startups.
+    const pumpA = pumps[0];
+    await pumpA.handleInput('parent', 'execsequence', 'startup');
+    // wait for warmup to complete
+    for (let i = 0; i < 200 && pumpA.state.getCurrentState() !== 'operational'; i++) await sleep(50);
+    assert.equal(pumpA.state.getCurrentState(), 'operational', 'pre-condition: pump_a should be operational');
+
+    // Put pump_a at ~30% of its per-pump flow range. This guarantees the
+    // optimizer's later combination will want pump_a to MOVE (either up to
+    // share work with the new pumps, or down to balance them) — either
+    // direction surfaces a rendezvous concern.
+    const sample = pumpA.groupPredictFlow ?? pumpA.predictFlow;
+    const perPumpMin_m3h = sample.currentFxyYMin * 3600;
+    const perPumpMax_m3h = sample.currentFxyYMax * 3600;
+    const initialFlow_m3h = perPumpMin_m3h + 0.30 * (perPumpMax_m3h - perPumpMin_m3h);
+    await pumpA.handleInput('parent', 'flowmovement', initialFlow_m3h);
+    await sleep(500); // let pump_a settle
+
+    const initialSnap = pumps.map((p) => ({ state: p.state.getCurrentState(), q: pumpFlow_m3h(p) }));
+    console.log('\nInitial state (1 running, 2 idle):');
+    for (let i = 0; i < pumps.length; i++) {
+        console.log(`  ${pumps[i].config.general.id}: ${initialSnap[i].state.padEnd(13)} Q=${initialSnap[i].q.toFixed(1)} m³/h`);
+    }
+    assert.equal(initialSnap[0].state, 'operational', 'pump_a operational at start');
+    assert.equal(initialSnap[1].state, 'idle', 'pump_b idle at start');
+    assert.equal(initialSnap[2].state, 'idle', 'pump_c idle at start');
+
+    // Phase 2: drive 90% demand — needs all 3 pumps.
+    const demandPct = 90;
+    const demand_m3s = pctToCanonical(mgc, demandPct);
+    const demand_m3h = demand_m3s * 3600;
+    console.log(`\nDispatching ${demandPct}% → ${demand_m3h.toFixed(1)} m³/h demand…`);
+
+    // Fire-and-don't-wait so we can sample DURING the move.
+    mgc.handleInput('parent', demand_m3s).catch(() => {});
+
+    // Give the dispatcher a microtask + tick to plan, then dump the
+    // schedule so we can see WHAT the planner produced (vs. what the
+    // executor actually does).
+    await sleep(60);
+    const sched = mgc.movementExecutor.schedule();
+    console.log(`\nPlanner schedule (tStar=${sched?.tStarS?.toFixed(2)}s, ${sched?.commands?.length} cmds):`);
+    for (const c of (sched?.commands || [])) {
+        console.log(`  ${c.machineId.padEnd(8)} ${c.action.padEnd(13)} ${c.sequence ?? ('flow=' + (c.flow?.toFixed(1) ?? 'n/a')).padEnd(12)}  fireAtTickN=${c.fireAtTickN}  eta=${c.eta?.toFixed(2)}s`);
+    }
+
+    // Sample for 8 seconds at 200 ms — long enough for tStar ≈ 3.5 s + ramp.
+    const traj = await sampleFlows(pumps, 8000, 200);
+
+    printTrace('Per-pump flow trajectory', traj, demand_m3h);
+
+    // ── Question (a): does sum-of-flows converge to demand? ────────────
+    const finalSum = traj[traj.length - 1].sum;
+    const tolAbs = demand_m3h * 0.05; // 5% tolerance
+    console.log(`\nFinal ΣQ = ${finalSum.toFixed(1)} m³/h vs demand ${demand_m3h.toFixed(1)} m³/h  (tol ±${tolAbs.toFixed(1)})`);
+    assert.ok(
+        Math.abs(finalSum - demand_m3h) <= tolAbs,
+        `(a) CONVERGENCE FAILED: final ΣQ=${finalSum.toFixed(1)} m³/h, demand=${demand_m3h.toFixed(1)} m³/h, err=${(finalSum - demand_m3h).toFixed(1)} m³/h (>${tolAbs.toFixed(1)})`,
+    );
+
+    // ── Question (b): same-time landing? ───────────────────────────────
+    //
+    // For each pump, find when its flow first reached a stable value (its
+    // own steady-state target). Compare the spread across the three pumps:
+    // if they "land together", all arrival indices are within ~1 sample.
+    const sampleTargets = pumps.map((_, i) => {
+        // Use the LAST sample's flow as that pump's actual landing value.
+        // We're measuring "when did this pump stop moving" not "did it hit
+        // some externally-specified target" — that's what same-time-landing
+        // is about.
+        return traj[traj.length - 1].perPump[i];
+    });
+    const arrivalIdx = pumps.map((_, i) => {
+        const series = traj.map((s) => s.perPump[i]);
+        const tgt = sampleTargets[i];
+        const tol = Math.max(2.0, Math.abs(tgt) * 0.05); // 5% or 2 m³/h, whichever larger
+        return arrivalTimeMs(series, tgt, tol);
+    });
+    console.log('\nArrival index per pump (sample # where flow stabilises within 5%):');
+    for (let i = 0; i < pumps.length; i++) {
+        const idx = arrivalIdx[i];
+        const t = idx == null ? 'NEVER' : `${(traj[idx].tMs / 1000).toFixed(2)} s`;
+        console.log(`  ${pumps[i].config.general.id}: idx=${idx}, t=${t}, finalQ=${sampleTargets[i].toFixed(1)} m³/h`);
+    }
+    const validIdx = arrivalIdx.filter((x) => x != null);
+    assert.equal(validIdx.length, N_PUMPS, '(b) one or more pumps never landed on a stable flow');
+
+    const spreadSamples = Math.max(...validIdx) - Math.min(...validIdx);
+    const spreadMs = spreadSamples * 200;
+    console.log(`Same-time-landing spread: ${spreadSamples} samples = ${spreadMs} ms`);
+    // Loose bound: within 1.5 s. A bigger spread means the schedule did
+    // NOT bring the pumps to their setpoints together.
+    assert.ok(
+        spreadMs <= 1500,
+        `(b) SAME-TIME LANDING FAILED: pumps landed ${spreadMs} ms apart (>1500 ms tolerance). ` +
+        `This means flow-INCREASING moves on running pumps land BEFORE startup pumps reach operational.`,
+    );
+});

test/integration/planner-rendezvous.integration.test.js

@@ -0,0 +1,210 @@
+// MGC + planner end-to-end integration. Proves the timing-aware
+// rendezvous schedule actually fires on real rotatingMachine objects
+// (not just the abstract scheduler unit tests).
+//
+// Layout mirrors idle-startup-deadlock.integration.test.js: three real
+// pump objects, a real MGC, registration via childRegistrationUtils. The
+// difference: instead of asserting end-state, we tap into the executor's
+// schedule + intercept fireCommand to record exact ordering.
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MachineGroup = require('../../src/specificClass');
+const Machine = require('../../../rotatingMachine/src/specificClass');
+
+const HEAD_MBAR_UP = 0;
+const HEAD_MBAR_DOWN = 1100;
+const N_PUMPS = 3;
+
+const LOG_DEBUG = process.env.LOG_DEBUG === '1';
+const logCfg = { enabled: LOG_DEBUG, logLevel: LOG_DEBUG ? 'debug' : 'error' };
+
+const stateConfig = {
+    general: { logging: logCfg },
+    state: { current: 'idle' },
+    movement: { mode: 'staticspeed', speed: 200, maxSpeed: 200, interval: 50 },
+    time: { starting: 1, warmingup: 2, stopping: 1, coolingdown: 2 },
+};
+
+function machineConfig(id) {
+    return {
+        general: { logging: logCfg, name: id, id, unit: 'm3/h' },
+        functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
+        asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
+        mode: {
+            current: 'auto',
+            allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
+            allowedSources: { auto: ['parent', 'GUI'] },
+        },
+        sequences: {
+            startup:       ['starting', 'warmingup', 'operational'],
+            shutdown:      ['stopping', 'coolingdown', 'idle'],
+            emergencystop: ['emergencystop', 'off'],
+        },
+    };
+}
+
+function groupConfig() {
+    return {
+        general: { logging: logCfg, name: 'mgc', id: 'mgc' },
+        functionality: { softwareType: 'machinegroup', role: 'groupcontroller', positionVsParent: 'atEquipment' },
+        mode: { current: 'optimalcontrol' },
+    };
+}
+
+function pctToCanonical(mgc, pct) {
+    if (pct < 0) return -1;
+    const dt = mgc.calcDynamicTotals();
+    return mgc.interpolation.interpolate_lin_single_point(pct, 0, 100, dt.flow.min, dt.flow.max);
+}
+
+function buildGroup() {
+    const mgc = new MachineGroup(groupConfig());
+    const ids = Array.from({ length: N_PUMPS }, (_, i) => `pump_${String.fromCharCode(97 + i)}`);
+    const pumps = ids.map((id) => new Machine(machineConfig(id), stateConfig));
+    for (const m of pumps) {
+        m.updateMeasuredPressure(HEAD_MBAR_UP,   'upstream',   { timestamp: Date.now(), unit: 'mbar', childName: 'up', childId: `up-${m.config.general.id}` });
+        m.updateMeasuredPressure(HEAD_MBAR_DOWN, 'downstream', { timestamp: Date.now(), unit: 'mbar', childName: 'dn', childId: `dn-${m.config.general.id}` });
+        mgc.childRegistrationUtils.registerChild(m, 'downstream');
+    }
+    mgc.calcAbsoluteTotals();
+    mgc.calcDynamicTotals();
+    return { mgc, pumps };
+}
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+// Wrap the MGC's executor.fireCommand so we record every command in
+// timing order. Replaces the actual fireCommand so the test stays
+// hermetic (pumps don't actually move — we just verify the SCHEDULE).
+function tapExecutor(mgc) {
+    const log = [];
+    const originalFire = mgc.movementExecutor._fireCommand;
+    mgc.movementExecutor._fireCommand = (cmd) => {
+        log.push({ ...cmd, firedAtMs: Date.now() });
+        // Still call the original so the FSM moves and the test stays realistic.
+        try { originalFire(cmd); } catch (_) { /* ignore */ }
+    };
+    return log;
+}
+
+// ── Tests ───────────────────────────────────────────────────────────────
+
+test('planner-integration: idle group → demand brings up all 3 pumps in lockstep', async () => {
+    const { mgc, pumps } = buildGroup();
+    const log = tapExecutor(mgc);
+
+    // 100% demand from idle → optimizer picks a 3-pump combination.
+    mgc.handleInput('parent', pctToCanonical(mgc, 100)).catch(() => {});
+    // Wait one tick so the executor's setInterval-driven follow-up ticks
+    // (if any) have a chance to fire. Three-pump symmetric startup has
+    // identical etas → tStar = max(eta) = eta itself → all commands at
+    // fireAtTickN=0 → all fire synchronously.
+    await sleep(50);
+
+    const startupCmds = log.filter((c) => c.action === 'execsequence' && c.sequence === 'startup');
+    const flowCmds    = log.filter((c) => c.action === 'flowmovement');
+
+    assert.equal(startupCmds.length, N_PUMPS, 'one startup per pump');
+    assert.equal(flowCmds.length,    N_PUMPS, 'one flowmovement per pump (queued via delayedMove)');
+    // All startups must be fired in the same tick — i.e. roughly the same
+    // wall-clock instant (within a few ms).
+    const spread = Math.max(...startupCmds.map((c) => c.firedAtMs)) - Math.min(...startupCmds.map((c) => c.firedAtMs));
+    assert.ok(spread < 50, `startup spread too wide: ${spread}ms`);
+});
+
+test('planner-integration: rendezvous — startup pump fires immediately, retarget on running pump is delayed', async () => {
+    // Bring up two pumps first; then change demand so the third pump
+    // starts AND the two existing pumps shed load. The two running pumps'
+    // flowmovement should be delayed so they land at the rendezvous time
+    // matching the third pump's startup completion.
+
+    const { mgc, pumps } = buildGroup();
+
+    // Phase 1: low demand so optimizer picks a sub-set of pumps and at
+    // least one stays idle. We try a few decreasing values until we find
+    // one that leaves an idle pump (optimizer's combination choice is
+    // sensitive to curve/pressure, hard to predict precisely).
+    let idlePumpFound = false;
+    for (const pct of [30, 20, 10, 5, 1]) {
+        mgc.handleInput('parent', pctToCanonical(mgc, pct)).catch(() => {});
+        await sleep(4500);
+        const states0 = pumps.map((p) => p.state.getCurrentState());
+        if (states0.includes('idle')) { idlePumpFound = true; break; }
+    }
+    if (!idlePumpFound) {
+        const finalStates = pumps.map((p) => p.state.getCurrentState());
+        console.log(`  (skipping) optimizer always picked all 3 pumps even at low demand: ${finalStates.join(',')}`);
+        return; // optimizer behaviour denies us the scenario — not a failure of the planner.
+    }
+
+    // Start tapping AFTER the first ramp settles — we only care about
+    // the schedule from the next dispatch.
+    const log = tapExecutor(mgc);
+
+    // Phase 2: drive to 100%. Now optimizer wants all 3 pumps. The idle
+    // pump needs full startup; existing pumps adjust their flow.
+    mgc.handleInput('parent', pctToCanonical(mgc, 100)).catch(() => {});
+    // Wait long enough for the executor's wall-clock ticks to fire
+    // delayed commands. tStar can be up to startingS + warmingupS + ramp
+    // = 1 + 2 + 0.5 = 3.5s.
+    await sleep(5000);
+
+    const startupCmds = log.filter((c) => c.action === 'execsequence' && c.sequence === 'startup');
+    const flowCmds    = log.filter((c) => c.action === 'flowmovement');
+
+    // We expect: at least one startup (for the idle pump) AND flow
+    // adjustments on the running pumps. The exact split depends on
+    // optimizer behaviour, so assert loosely.
+    assert.ok(startupCmds.length >= 1, 'at least one startup expected for the idle pump');
+    assert.ok(flowCmds.length    >= 1, 'at least one flowmovement expected');
+
+    // The schedule snapshot stored on the executor should record a
+    // positive tStar (rendezvous time).
+    const lastSchedule = mgc.movementExecutor.schedule();
+    assert.ok(lastSchedule, 'executor schedule should be set');
+    // The schedule should have at least one increasing eta (the startup),
+    // which sets tStar > 0.
+    assert.ok(lastSchedule.tStarS > 0, `tStar should be > 0 when a startup is in the plan; got ${lastSchedule.tStarS}`);
+
+    // If any flowmovement on an EXISTING (then-operational) pump was a
+    // down-move, its fireAtTickN should be > 0 (delayed). Find any such
+    // command in the schedule.
+    const delayedDownMoves = lastSchedule.commands.filter((c) => c.action === 'flowmovement' && c.fireAtTickN > 0);
+    // Note: this assertion is "expected on most runs" rather than
+    // "guaranteed every time" — depends on whether the optimizer picks a
+    // combination that requires existing pumps to reduce. We assert the
+    // schedule SHAPE (positive tStar) and accept that delayed-down moves
+    // are common-but-not-mandatory.
+    if (delayedDownMoves.length === 0) {
+        // Surface a debug print if the run didn't exercise delayed moves —
+        // helps when reading test logs to know what happened.
+        console.log('  (planner-integration) note: no delayed down-moves this run — combination may have been all-up.');
+    }
+});
+
+test('planner-integration: replan drops unfired commands when a new demand arrives', async () => {
+    const { mgc, pumps } = buildGroup();
+    const log = tapExecutor(mgc);
+
+    // First demand: 100% from idle. tStar will be ~3.5s; all startup
+    // cmds fire at tick 0 (synchronous), but if there were any delayed
+    // down-moves, they'd be in the schedule.
+    mgc.handleInput('parent', pctToCanonical(mgc, 100)).catch(() => {});
+    await sleep(100);
+    const firstSnapshot = mgc.movementExecutor.schedule().commands.length;
+
+    // Immediately fire a second demand: 50%. Replan happens; some unfired
+    // commands from the first schedule get dropped.
+    mgc.handleInput('parent', pctToCanonical(mgc, 50)).catch(() => {});
+    await sleep(100);
+
+    // Schedule was replaced.
+    const secondSnapshot = mgc.movementExecutor.schedule();
+    assert.ok(secondSnapshot, 'executor schedule replaced after replan');
+    // Cursor reset to a low value (≤ a couple of ticks from the replan).
+    assert.ok(mgc.movementExecutor.cursor() <= 2, `cursor should reset on replan; got ${mgc.movementExecutor.cursor()}`);
+    // Sanity: replan didn't blow up the executor.
+    assert.ok(firstSnapshot > 0, 'first dispatch should have queued at least one command');
+});

test/integration/structure-examples.integration.test.js

@@ -9,14 +9,16 @@ function loadJson(file) {
   return JSON.parse(fs.readFileSync(path.join(dir, file), 'utf8'));
 }
 
+const FLOW_FILES = ['01-Basic.json', '02-Dashboard.json'];
+
 test('examples package exists for machineGroupControl', () => {
-  for (const file of ['README.md', 'basic.flow.json', 'integration.flow.json', 'edge.flow.json']) {
+  for (const file of ['README.md', ...FLOW_FILES]) {
     assert.equal(fs.existsSync(path.join(dir, file)), true, file + ' missing');
   }
 });
 
 test('example flows are parseable arrays for machineGroupControl', () => {
-  for (const file of ['basic.flow.json', 'integration.flow.json', 'edge.flow.json']) {
+  for (const file of FLOW_FILES) {
     const parsed = loadJson(file);
     assert.equal(Array.isArray(parsed), true);
   }

test/integration/turnoff-deadlock.integration.test.js

@@ -0,0 +1,141 @@
+// Regression: pump A in pumpingstation-complete-example demo got stuck
+// running at minimum flow while basin level dropped past stopLevel and
+// kept dropping all the way to dry-run threshold.
+//
+// Root cause (two parts):
+//
+// 1. rotatingMachine.executeSequence on shutdown went through an
+//    interruptible-abort path that returned the FSM to 'operational',
+//    triggering state.transitionToState's auto-pickup of the queued
+//    delayedMove — re-engaging the pump before the shutdown sequence
+//    could reach stopping/coolingdown/idle. Fix: clear delayedMove at
+//    the top of shutdown/emergencystop sequences.
+//
+// 2. PS calls turnOffAllMachines on every tick (every 2 s) while
+//    level < stopLevel. Each call interrupted the still-running prior
+//    shutdown's transitions, resetting the FSM to 'accelerating'. The
+//    pump bounced accelerating ↔ decelerating forever and the actual
+//    shutdown sequence transitions never ran. Fix: serialize per-pump
+//    shutdown calls in turnOffAllMachines so concurrent invocations
+//    are no-ops while a shutdown is already in flight.
+//
+// This test exercises part 2 — the per-pump serialization at the MGC
+// level — by hammering turnOffAllMachines from a tight loop, mirroring
+// the live tick cadence.
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const MachineGroup = require('../../src/specificClass');
+const Machine = require('../../../rotatingMachine/src/specificClass');
+
+const logCfg = { enabled: false, logLevel: 'error' };
+
+const stateConfig = {
+  general: { logging: logCfg },
+  state: { current: 'idle' },
+  movement: { mode: 'staticspeed', speed: 50, maxSpeed: 100, interval: 10 },
+  // Non-zero shutdown timing so a shutdown takes long enough that a
+  // concurrent turnOff call lands mid-sequence — exactly the live race.
+  time: { starting: 0, warmingup: 0, stopping: 1, coolingdown: 1 },
+};
+
+function machineConfig(id) {
+  return {
+    general: { logging: logCfg, name: id, id, unit: 'm3/h' },
+    functionality: { softwareType: 'machine', role: 'rotationaldevicecontroller' },
+    asset: { model: 'hidrostal-H05K-S03R', unit: 'm3/h' },
+    mode: {
+      current: 'auto',
+      allowedActions: { auto: ['execsequence', 'execmovement', 'flowmovement', 'statuscheck'] },
+      allowedSources: { auto: ['parent', 'GUI'] },
+    },
+    sequences: {
+      startup:        ['starting', 'warmingup', 'operational'],
+      shutdown:       ['stopping', 'coolingdown', 'idle'],
+      emergencystop:  ['emergencystop', 'off'],
+    },
+  };
+}
+
+function groupConfig() {
+  return {
+    general: { logging: logCfg, name: 'mgc', id: 'mgc' },
+    functionality: { softwareType: 'machinegroup', role: 'groupcontroller', positionVsParent: 'atEquipment' },
+    mode:    { current: 'optimalcontrol' },
+  };
+}
+
+function buildGroup() {
+  const mgc = new MachineGroup(groupConfig());
+  const ids = ['pump_a', 'pump_b', 'pump_c'];
+  const pumps = ids.map(id => new Machine(machineConfig(id), stateConfig));
+  for (const m of pumps) {
+    m.updateMeasuredPressure(0,    'upstream',   { timestamp: Date.now(), unit: 'mbar', childName: 'up', childId: `up-${m.config.general.id}` });
+    m.updateMeasuredPressure(1100, 'downstream', { timestamp: Date.now(), unit: 'mbar', childName: 'dn', childId: `dn-${m.config.general.id}` });
+    mgc.childRegistrationUtils.registerChild(m, 'downstream');
+  }
+  mgc.calcAbsoluteTotals();
+  mgc.calcDynamicTotals();
+  return { mgc, pumps };
+}
+
+const sleep = (ms) => new Promise(r => setTimeout(r, ms));
+
+test('repeated turnOffAllMachines reaches idle (serializes concurrent shutdowns)', async () => {
+  const { mgc, pumps } = buildGroup();
+  const pumpA = pumps[0];
+
+  // Start pump A and queue a delayedMove the way MGC's optimalControl
+  // would when PS sends a 1% dead-zone keep-alive.
+  await pumpA.handleInput('parent', 'execsequence', 'startup');
+  assert.equal(pumpA.state.getCurrentState(), 'operational');
+  pumpA.setpoint(80);                  // start a slow move (not awaited)
+  await sleep(50);
+  assert.equal(pumpA.state.getCurrentState(), 'accelerating');
+  pumpA.state.delayedMove = 75;
+
+  // Mimic PS's tick loop: fire turnOffAllMachines on a tight cadence
+  // without awaiting. Without the per-pump serialization in
+  // turnOffAllMachines, each call hits the still-running prior shutdown
+  // and bounces the pump back to accelerating — the live deadlock.
+  const ticks = [];
+  for (let i = 0; i < 6; i++) {
+    ticks.push(mgc.turnOffAllMachines());
+    await sleep(80);                   // half the realtime tick — tighter race
+  }
+  await Promise.all(ticks);
+  // Allow the (single) in-flight shutdown to finish its 1+1 s timed
+  // transitions through stopping → coolingdown → idle.
+  await sleep(2500);
+
+  assert.equal(pumpA.state.getCurrentState(), 'idle',
+    `pump must reach idle under repeated turnOff calls; got ${pumpA.state.getCurrentState()} (delayedMove=${pumpA.state.delayedMove})`);
+  assert.equal(pumpA.state.delayedMove, null,
+    'delayedMove must be cleared after shutdown');
+});
+
+test('turnOffAllMachines cancels any parked demand so it cannot re-engage pumps', async () => {
+  // PS sends a 1% keep-alive while MGC is mid-dispatch. MGC parks it in
+  // its demand dispatcher's latest-wins slot. PS then crosses stopLevel
+  // and calls turnOffAllMachines. Without cancelPending(), the parked
+  // 1% call would fire AFTER the shutdown — re-engaging the pump.
+  const { mgc } = buildGroup();
+  const gate = mgc._demandDispatcher._gate;
+  // Pin a fake in-flight dispatch then park a pending call behind it.
+  gate._inFlight = true;
+  const parked = mgc.handleInput('parent', 1, Infinity, null);
+
+  await mgc.turnOffAllMachines();
+
+  // Re-open the gate: the in-flight pin is artificial. Awaiting the
+  // parked promise must yield the SUPERSEDED sentinel (i.e. it was
+  // cancelled, not run).
+  const res = await parked;
+  assert.ok(res && res.superseded === true,
+    'parked demand must resolve as superseded after turnOffAllMachines cancels it');
+  // Idle now — pending slot must be clear.
+  assert.equal(gate._pending, null,
+    'turnOff must cancel any parked demand so it cannot re-engage pumps post-shutdown');
+  gate._inFlight = false;
+});

wiki/Home.md

@@ -0,0 +1,148 @@
+# machineGroupControl
+
+![code-ref](https://img.shields.io/badge/code--ref-26e92b5-blue) ![s88](https://img.shields.io/badge/S88-Unit-50a8d9) ![status](https://img.shields.io/badge/status-trial--ready-brightgreen)
+
+A `machineGroupControl` (MGC) coordinates two or more `rotatingMachine` children that share a common header. It accepts an operator demand setpoint, enumerates the valid pump combinations against the group's live flow/power envelope, picks the best operating point (BEP-Gravitation by default), and schedules per-machine flow setpoints + start/stop commands with **timing-aware rendezvous** so the running aggregate stays close to demand during transitions.
+
+---
+
+## At a glance
+
+| Thing | Value |
+|:---|:---|
+| What it represents | A pump group sharing one suction + one discharge header |
+| S88 level | Unit |
+| Use it when | You have 2 + pumps that can substitute for each other on the same header and you want efficient load-sharing |
+| Don't use it for | A single pump (wire `rotatingMachine` directly), valves (use `valveGroupControl`), or pumps living behind independent headers |
+| Children it accepts | `machine` (rotatingMachine), `measurement` (pressure / others) |
+| Parent it talks to | `pumpingStation` (typical), or any node that issues `set.demand` |
+
+---
+
+## How it fits
+
+```mermaid
+flowchart LR
+    parent[pumpingStation<br/>Process Cell]:::pc -->|set.demand| mgc[machineGroupControl<br/>Unit]:::unit
+    header[measurement<br/>header pressure]:::ctrl -.measured.-> mgc
+    mgc -->|flowmovement / execsequence| m_a[rotatingMachine A]:::equip
+    mgc -->|flowmovement / execsequence| m_b[rotatingMachine B]:::equip
+    mgc -->|flowmovement / execsequence| m_c[rotatingMachine C]:::equip
+    mgc -->|child.register| parent
+    m_a -->|child.register| mgc
+    m_b -->|child.register| mgc
+    m_c -->|child.register| mgc
+    classDef pc fill:#0c99d9,color:#fff
+    classDef unit fill:#50a8d9,color:#000
+    classDef equip fill:#86bbdd,color:#000
+    classDef ctrl fill:#a9daee,color:#000
+```
+
+S88 colours are anchored in `.claude/rules/node-red-flow-layout.md`.
+
+---
+
+## Try it &mdash; 3-minute demo
+
+Import the basic example flow, deploy, and watch three pumps come online together when demand rises.
+
+```bash
+curl -X POST -H 'Content-Type: application/json' \
+  --data @nodes/machineGroupControl/examples/01-Basic.json \
+  http://localhost:1880/flow
+```
+
+What to click in the dashboard after deploy:
+
+1. The Setup group auto-fires `virtualControl` + `cmd.startup` on each child pump after ~1.5&nbsp;s.
+2. `set.demand = 50` (bare number = percent of group capacity) &rarr; MGC picks the best 1- or 2-pump combination by BEP-Gravitation.
+3. `set.demand = { value: 80, unit: "m3/h" }` &rarr; absolute-flow setpoint.
+4. `set.mode = priorityControl` &rarr; equal-flow distribution by priority order.
+5. `set.demand = -1` &rarr; operator stop-all; `turnOffAllMachines` cancels any pending dispatch and shuts every active pump down.
+
+> [!IMPORTANT]
+> **GIF needed.** Demo recording of demand 50 % &rarr; 100 % &rarr; -1 with the live status panel. Save as `wiki/_partial-gifs/machineGroupControl/01-basic-demo.gif`, target &le; 1&nbsp;MB after `gifsicle -O3 --lossy=80`.
+
+---
+
+## The three things you'll send
+
+`set.demand` is **unit-self-describing** &mdash; the payload itself decides how the value is interpreted. There is no persistent `scaling` state on the orchestrator.
+
+| Topic | Aliases | Payload | What it does |
+|:---|:---|:---|:---|
+| `set.mode` | `setMode` | `"optimalControl"` \| `"priorityControl"` \| `"maintenance"` | Switches dispatch strategy. `maintenance` is monitoring-only. |
+| `set.demand` | `Qd` | bare number = %; `{value, unit}` for absolute units (`m3/h`, `l/s`, `m3/s`, &hellip;); negative = stop all | Operator demand setpoint. Resolves to canonical m³/s before dispatch. |
+| `child.register` | `registerChild` | child node id (string) | Manually register a child (Port 2 wiring does this automatically in most flows). |
+
+---
+
+## What you'll see come out
+
+Sample Port 0 message (delta-compressed &mdash; only changed fields each tick):
+
+```json
+{
+  "topic": "machineGroupControl#MGC1",
+  "payload": {
+    "mode": "optimalControl",
+    "atEquipment_predicted_flow": 42.5,
+    "downstream_predicted_flow": 42.5,
+    "atEquipment_predicted_power": 18.0,
+    "headerDiffPa": 145000,
+    "headerDiffMbar": 1450,
+    "flowCapacityMax": 90,
+    "flowCapacityMin": 6,
+    "machineCount": 3,
+    "machineCountActive": 2,
+    "absDistFromPeak": 0.02,
+    "relDistFromPeak": 0.10
+  }
+}
+```
+
+| Field | Meaning |
+|:---|:---|
+| `mode` | Current dispatch mode. |
+| `atEquipment_predicted_flow` / `_power` | Group aggregate at the pump shafts. The optimizer writes intent here; `handlePressureChange` keeps it in sync with the live totals. |
+| `downstream_predicted_flow` | Live aggregate mirrored onto DOWNSTREAM &mdash; pumpingStation parents subscribe here. |
+| `headerDiffPa` / `headerDiffMbar` | Last header differential the equalizer resolved. Dashboards use it for Q-H plots without re-reading every child. |
+| `flowCapacityMax` / `flowCapacityMin` | The group's dynamic envelope at the current header pressure. Defines where `set.demand` (as %) maps to. |
+| `machineCount` / `machineCountActive` | All registered children, and how many are in a state other than `off` / `maintenance`. |
+| `absDistFromPeak` / `relDistFromPeak` | Distance from group BEP. `relDistFromPeak` is `undefined` when the η spread collapses (homogeneous pump group). |
+
+The key shape is `<position>_<variant>_<type>` &mdash; the inverse of `rotatingMachine`'s `<type>.<variant>.<position>.<childId>` key shape, because MGC's output is the group aggregate, not a per-child snapshot.
+
+---
+
+## The new bit &mdash; the movement planner
+
+When MGC computes a new optimal combination it doesn't fan the commands out instantly. It builds a **schedule** that times each command so the running aggregate stays close to demand during the transition.
+
+```mermaid
+flowchart LR
+    demand[set.demand] --> dispatch[_runDispatch<br/>latest-wins]
+    dispatch --> abort[abortActiveMovements]
+    abort --> opt[optimizer.calcBestCombination*]
+    opt --> profiles[buildProfile<br/>x children]
+    profiles --> plan[movementScheduler.plan<br/>rendezvous t* = max&#40;eta_i&#41;]
+    plan --> exec[movementExecutor.replan<br/>+ await tick&#40;&#41;]
+    exec --> kids[rotatingMachine x N<br/>flowmovement / execsequence]
+```
+
+The planner classifies each pump's required move (`startup` / `flowmove` / `shutdown` / `noop`), computes an ETA per move via `MoveTrajectory`, sets the rendezvous time `t* = max(eta_i)` over flow-INCREASING moves, and delays flow-DECREASING moves so they FINISH at `t*`. Net effect: the sum of flows tracks the demand smoothly during the transition; on overshoot the header pressure rises and self-corrects.
+
+This path is exercised in `optimalControl` mode. `priorityControl` mode still uses the legacy direct-dispatch path (`control.equalFlowControl`) &mdash; the planner has not been wired through there yet.
+
+---
+
+## Need more?
+
+| Page | What you'll find |
+|:---|:---|
+| [Reference &mdash; Contracts](Reference-Contracts) | Topic registry, config schema, child registration filters |
+| [Reference &mdash; Architecture](Reference-Architecture) | Code map, dispatch lifecycle, planner internals, output ports |
+| [Reference &mdash; Examples](Reference-Examples) | Shipped flows, debug recipes |
+| [Reference &mdash; Limitations](Reference-Limitations) | When not to use, known issues, open questions |
+
+[EVOLV master wiki](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Home) &middot; [Topology Patterns](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topology-Patterns) &middot; [Topic Conventions](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topic-Conventions)

wiki/Reference-Architecture.md

@@ -0,0 +1,261 @@
+# Reference — Architecture
+
+![code-ref](https://img.shields.io/badge/code--ref-26e92b5-blue)
+
+> [!NOTE]
+> Code structure for `machineGroupControl`: the three-tier sandwich, the `src/` layout, the dispatch lifecycle, the movement planner that fans commands out, and the output-port pipeline. Everything here is reproducible from `src/`. For an intuitive overview, return to [Home](Home).
+
+---
+
+## Three-tier code layout
+
+```
+nodes/machineGroupControl/
+|
++-- mgc.js                         entry: RED.nodes.registerType('machineGroupControl', NodeClass)
+|
++-- src/
+|     nodeClass.js                 extends BaseNodeAdapter (Node-RED bridge)
+|     specificClass.js             extends BaseDomain (orchestration only)
+|     |
+|     +-- commands/
+|     |     index.js               topic descriptors
+|     |     handlers.js            pure handler functions (unit-self-describing set.demand)
+|     |
+|     +-- groupOps/
+|     |     groupOperatingPoint.js header equalisation + child read helpers
+|     |     groupCurves.js         per-machine curve adapters used by optimizer + strategies
+|     |
+|     +-- totals/
+|     |     totalsCalculator.js    absolute, dynamic, and active envelopes
+|     |
+|     +-- combinatorics/
+|     |     pumpCombinations.js    enumerate valid pump subsets that can deliver Qd
+|     |
+|     +-- optimizer/
+|     |     index.js               selector (CoG vs BEP-Gravitation variants)
+|     |     bestCombination.js     N-CoG optimizer
+|     |     bepGravitation.js      BEP-Gravitation (+ Directional variant)
+|     |
+|     +-- efficiency/
+|     |     groupEfficiency.js     group η, BEP distance (abs + relative)
+|     |
+|     +-- control/
+|     |     strategies.js          equalFlowControl (priority mode legacy direct dispatch)
+|     |
+|     +-- dispatch/
+|     |     demandDispatcher.js    thin wrapper over LatestWinsGate.fireAndWait
+|     |
+|     +-- movement/
+|     |     machineProfile.js      pure snapshot of a registered child for the planner
+|     |     moveTrajectory.js      per-pump ETA-to-target math
+|     |     movementScheduler.js   rendezvous planner (pure)
+|     |     movementExecutor.js    tick-driven, async-aware command firer
+|     |
+|     +-- io/
+|           output.js              getOutput() shape + status badge
+```
+
+### Tier responsibilities
+
+| Tier | File | What it owns | Touches `RED.*` |
+|:---|:---|:---|:---:|
+| entry | `mgc.js` | Type registration | Yes |
+| nodeClass | `src/nodeClass.js` | Input routing, output ports, status badge polling (`statusInterval=1000`). No tick loop — event-driven. | Yes |
+| specificClass | `src/specificClass.js` | Wire concern modules in `configure()`; route demand through `DemandDispatcher`; pick mode in `_runDispatch`; own the planner's wall-clock driver. | No |
+
+`specificClass` is stitching. All real work lives in the concern modules: pure math in `combinatorics/`, `optimizer/`, `efficiency/`, `movement/{moveTrajectory,movementScheduler}`; live-state-touching in `groupOps/`, `totals/`, `control/`, `dispatch/`, `movement/movementExecutor`.
+
+---
+
+## The dispatch lifecycle
+
+```mermaid
+sequenceDiagram
+    autonumber
+    participant parent as pumpingStation / UI
+    participant gate as DemandDispatcher (LatestWinsGate)
+    participant disp as _runDispatch
+    participant abort as abortActiveMovements
+    participant opt as optimizer
+    participant plan as movementScheduler
+    participant exec as movementExecutor
+    participant kids as rotatingMachine[]
+
+    parent->>gate: handleInput(Qd)
+    Note over gate: latest-wins:<br/>parked demand is dropped if a fresher one arrives
+    gate->>disp: payload.demand = canonical m³/s
+    disp->>abort: abortActiveMovements('new demand')
+    disp->>disp: calcDynamicTotals + clamp Qd to envelope
+    alt mode = optimalControl
+        disp->>opt: pickOptimizer(method).calcBestCombination*
+        opt-->>disp: bestCombination + bestFlow / bestPower / bestCog
+        disp->>plan: plan(profiles, combination, headerDiffPa)
+        plan-->>disp: schedule {tStarS, tickS, commands[]}
+        disp->>exec: replan(schedule)
+        disp->>exec: await tick()         (FIRST tick, synchronous race-favouring)
+        Note over exec: setInterval(1000ms) drives further ticks<br/>auto-stops when pending() == 0
+    else mode = priorityControl
+        disp->>disp: control.equalFlowControl(ctx, Qd, powerCap, priorityList)
+        Note over disp: Legacy direct fan-out:<br/>await Promise.all(...handleInput...)
+    end
+    exec->>kids: flowmovement / execsequence (per scheduled tick)
+    disp->>disp: handlePressureChange-style refresh<br/>notifyOutputChanged
+```
+
+Key facts the diagram pins down:
+
+| Fact | Why it matters |
+|:---|:---|
+| Demand serialisation is **latest-wins**, not FIFO | A burst of demand updates collapses to a single dispatch. Parked demands resolve with `{ superseded: true }` so callers can branch on it. |
+| `abortActiveMovements` only aborts pumps in `accelerating` / `decelerating` | Warmup / cooldown are protected at the pump's FSM; aborting them is silently ignored there. |
+| `_runDispatch` **awaits the first executor tick** | Synchronous first-tick fire gives the new move's residue-handler priority over an in-flight shutdown sequence's for-loop. Fire-and-forget would lose the race in real wall-clock conditions. |
+| The 1&nbsp;Hz `setInterval` only runs while `executor.pending() > 0` | Idle MGCs don't burn a forever-on timer. |
+| Negative demand goes straight to `turnOffAllMachines` | And `turnOffAllMachines` calls `dispatcher.cancelPending` so a parked positive demand can't re-engage pumps post-shutdown. |
+| `priorityControl` uses the legacy direct-dispatch path | The planner is not (yet) wired through `equalFlowControl`. See [Reference &mdash; Limitations](Reference-Limitations). |
+
+---
+
+## The movement planner
+
+The planner is the new architectural layer between the optimizer and the children. It exists so that when MGC re-balances during transitions, the running aggregate flow stays close to demand instead of dipping while one pump warms up and another keeps spinning.
+
+### 1. `buildProfile(child)` &mdash; pure read
+
+A plain-object snapshot of a registered child machine. Returns:
+
+| Field | Source | Notes |
+|:---|:---|:---|
+| `id` | `child.config.general.id` | |
+| `state` | `child.state.getCurrentState()` | One of `idle`, `starting`, `warmingup`, `operational`, `accelerating`, `decelerating`, `stopping`, `coolingdown`, `off`, `emergencystop`, `maintenance`. |
+| `position` | `child.state.getCurrentPosition()` | Control % (`0..100`). |
+| `minPosition` / `maxPosition` | `child.state.movementManager` | |
+| `velocityPctPerS` | `movementManager.getNormalizedSpeed() × range` | Movement ramp rate in position-units / second. |
+| `timings` | `child.config.stateConfig.time` | `{startingS, warmingupS, stoppingS, coolingdownS}` &mdash; the configured durations the FSM spends in each timed state. |
+| `remainingTransitionS` | `child.state.stateManager.getRemainingTransitionS()` | Wall-clock-aware remaining seconds in the current timed state. 0 for untimed states. |
+| `flowAt(pos, pressure)` | `child.predictFlow.evaluate` | Forward curve (position → flow). |
+| `positionForFlow(flow)` | `child.predictCtrl.y` | Inverse curve (flow → control %); mirrors what `flowController` does on a `flowmovement` command. |
+
+No contract changes &mdash; MGC already holds the live child reference (`this.machines[id]`); the profile is just a read of that.
+
+### 2. `MoveTrajectory` &mdash; per-pump ETA math
+
+Given a profile and a `targetPosition`, `etaToTargetS()` returns seconds-to-target-flow:
+
+| Current state | ETA |
+|:---|:---|
+| `idle` / `off` / `emergencystop` / `maintenance` | `startingS + warmingupS + (target − minPosition) / velocity` |
+| `operational` / `accelerating` / `decelerating` (post-abort residue) | `\|target − position\| / velocity` |
+| `warmingup` | `remainingTransitionS + (target − minPosition) / velocity` |
+| `starting` | `remainingTransitionS + warmingupS + (target − minPosition) / velocity` |
+| `stopping` / `coolingdown` | `null` &mdash; pump cannot contribute on this dispatch |
+
+Velocity of 0 returns `Infinity` so the scheduler can demote the machine without crashing. Targets are clamped to `[minPosition, maxPosition]` at construction.
+
+### 3. `movementScheduler.plan` &mdash; rendezvous
+
+Pure function. Inputs: `(profiles[], combination, currentPressurePa, { tickS = 1 })`. Output:
+
+```js
+{
+  tStarS: 60,        // rendezvous time in seconds
+  tickS: 1,          // tick cadence
+  commands: [
+    { machineId: 'A', action: 'execsequence', sequence: 'startup',  fireAtTickN: 0,  eta: 60 },
+    { machineId: 'A', action: 'flowmovement', flow: 60,             fireAtTickN: 0,  eta: 60 },
+    { machineId: 'B', action: 'flowmovement', flow: 40,             fireAtTickN: 40, eta: 20 },
+    { machineId: 'C', action: 'execsequence', sequence: 'shutdown', fireAtTickN: 55, eta:  5 }
+  ],
+  _plans: [...]      // per-machine classification + eta + direction; useful in tests
+}
+```
+
+Algorithm:
+
+1. **Classify** each machine's move against the optimizer's target flow:
+   - `targetFlow > 0` and pump off &rarr; `startup`
+   - `targetFlow > 0` and pump on (any active or startup-ladder state) &rarr; `flowmove`
+   - `targetFlow <= 0` and pump on &rarr; `shutdown`
+   - Otherwise &rarr; `noop`
+2. **Direction**: compare target flow against the pump's current flow (via `profile.flowAt`). Increasing, decreasing, or unchanged.
+3. **ETA**: `MoveTrajectory.etaToTargetS()` (or, for shutdowns, the position-ramp time to `minPosition`).
+4. **Rendezvous**: `t* = max(eta_i)` over flow-INCREASING moves.
+5. **Schedule**: increasing / unchanged moves fire at `fireAtTickN = 0`; decreasing moves fire at `fireAtTickN = round((t* − eta_j) / tickS)` so they finish at `t*`.
+
+Net behaviour: during a transition the flow sum tracks demand smoothly. On overshoot, header pressure rises and individual pumps deliver less &mdash; a self-correcting undershoot. On undershoot, demand simply lands a few ticks later than ideal.
+
+### 4. `MovementExecutor` &mdash; tick-driven, async-aware
+
+Holds the active schedule plus a cursor (`_cursor`) that advances one per `tick()`. Each tick fires every unfired command whose `fireAtTickN <= cursor` via an injected `fireCommand` callback. The callback returns a Promise (in production, the `machine.handleInput(...)` promise); `tick()` awaits all of those before resolving.
+
+`replan(newSchedule)` replaces the schedule and resets the cursor to 0. Already-fired commands stay fired &mdash; the pump's FSM downstream owns their consequences; the executor never tries to "undo" a fired startup (which keeps warmup / cooldown safety intact).
+
+Wall-clock driver lives on the MGC itself (`_ensureExecutorTimer`): a `setInterval(1000)` that calls `tick()` and clears itself when `pending() === 0`. `unref()` keeps the timer from blocking Node-RED shutdown.
+
+### 5. The cooperating FSM change (in `rotatingMachine`)
+
+For the planner to be robust, the pump's `executeSequence` honours a **sequence-abort token** that MGC's external aborts advance. Without this, an in-flight shutdown's for-loop would race against the new dispatch's residue handler and could win &mdash; transitioning `operational → stopping → coolingdown → idle` even after the new move took the FSM operational.
+
+See the rotatingMachine wiki's [Architecture &mdash; FSM section](https://gitea.wbd-rd.nl/RnD/rotatingMachine/wiki/Reference-Architecture#fsm) for the full mechanism. Summary:
+
+- `state.abortCurrentMovement(reason, { returnToOperational: false })` &mdash; the default form, used by MGC's `abortActiveMovements` &mdash; increments `state.sequenceAbortToken`.
+- `executeSequence` captures the token at entry and re-checks it before every state transition in its for-loop. A mismatch exits the loop early with a `Sequence '<name>' interrupted ... by external abort` warning.
+- Sequence-internal aborts (`returnToOperational: true`, used when a fresher shutdown pre-empts its own setpoint ramp) do NOT advance the token. So the shutdown's own ramp-down to zero is interruptible without terminating the shutdown sequence itself.
+
+---
+
+## Output ports
+
+| Port | Carries | Sample shape |
+|:---|:---|:---|
+| 0 (process) | Delta-compressed state snapshot &mdash; group aggregates, header diff, BEP distance, machine counts | `{topic, payload: {mode, atEquipment_predicted_flow, headerDiffPa, machineCountActive, ...}}` |
+| 1 (telemetry) | InfluxDB line-protocol payload (same fields as Port 0) | `machineGroupControl,id=MGC1 atEquipment_predicted_flow=42.5,... ` |
+| 2 (register / control) | `child.register` upward at init | `{topic: 'child.register', payload: {ref, softwareType, config}}` |
+
+Port-0 key shape is **`<position>_<variant>_<type>`** &mdash; group aggregates only. Per-pump series live on each `rotatingMachine`'s Port 0 (with the inverted `<type>.<variant>.<position>.<childId>` shape). Subscribe per-child if you need per-pump trends on a dashboard.
+
+See [EVOLV &mdash; Telemetry](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Telemetry) for the full InfluxDB layout.
+
+---
+
+## Event sources
+
+| Source | Where it fires | What it triggers |
+|:---|:---|:---|
+| `setInterval(_executorIntervalMs = 1000)` | Driven by `_ensureExecutorTimer` after a successful `optimalControl` plan | `movementExecutor.tick()` |
+| `setInterval(statusInterval = 1000)` | `BaseNodeAdapter` | Status badge re-render |
+| Inbound `msg.topic` | Node-RED input wire | `commandRegistry` dispatch to `set.mode` / `set.demand` / `child.register` |
+| Child measurement event | `child.measurements.emitter` after a measurement landed | `handlePressureChange()` (for pressure) or value mirror (for everything else) |
+| Child prediction event | `child.emitter` "flow.predicted.downstream" | `handlePressureChange()` |
+| `child.register` from a pump | Port 2 of the pump | `onRegister('machine', ...)` &mdash; stores ref in `this.machines[id]` |
+
+MGC has **no per-second tick of its own**. It's purely event-driven plus the planner's optional wall-clock executor.
+
+---
+
+## Where to start reading
+
+| If you're changing... | Read first |
+|:---|:---|
+| The dispatch flow, latest-wins semantics, mode switch | `src/specificClass.js` `_runDispatch` (lines 318&ndash;349) |
+| Topic registration, payload validation | `src/commands/index.js` + `src/commands/handlers.js` |
+| Optimizer selection / scoring | `src/optimizer/index.js`, `bepGravitation.js`, `bestCombination.js` |
+| Header-pressure equalisation | `src/groupOps/groupOperatingPoint.js` `equalize()` |
+| Combination enumeration | `src/combinatorics/pumpCombinations.js` |
+| Per-pump ETA, rendezvous math | `src/movement/moveTrajectory.js`, `movementScheduler.js` |
+| Wall-clock tick wiring | `src/specificClass.js` `_ensureExecutorTimer` (lines 290&ndash;301) |
+| Output shape, status badge | `src/io/output.js` |
+| Priority-mode equal-flow distribution | `src/control/strategies.js` |
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference &mdash; Contracts](Reference-Contracts) | Topic + config + child filters |
+| [Reference &mdash; Examples](Reference-Examples) | Shipped flows + debug recipes |
+| [Reference &mdash; Limitations](Reference-Limitations) | Known issues and open questions |
+| [rotatingMachine wiki](https://gitea.wbd-rd.nl/RnD/rotatingMachine/wiki/Home) | The child node: FSM, prediction, drift |
+| [EVOLV &mdash; Architecture](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Architecture) | Platform-wide three-tier pattern |

wiki/Reference-Contracts.md

@@ -0,0 +1,196 @@
+# Reference — Contracts
+
+![code-ref](https://img.shields.io/badge/code--ref-26e92b5-blue)
+
+> [!NOTE]
+> Full topic contract, configuration schema, and child-registration filters for `machineGroupControl`. Source of truth: `src/commands/index.js`, `src/specificClass.js` `configure()`, and the schema at `generalFunctions/src/configs/machineGroupControl.json`.
+>
+> For an intuitive overview, return to the [Home](Home).
+
+---
+
+## Topic contract
+
+The MGC accepts three canonical topics. `set.demand` is the only one with semantic content; the other two are simple state changes.
+
+| Canonical topic | Aliases | Payload | Unit handling | Effect |
+|:---|:---|:---|:---|:---|
+| `set.mode` | `setMode` | `string` (`"optimalControl"` \| `"priorityControl"` \| `"maintenance"`) | — | Switch the dispatch strategy. `maintenance` is monitoring-only — the dispatch switch warns and skips. |
+| `set.demand` | `Qd` | bare number, OR `{value: number, unit: string}` | self-describing (see below) | Operator demand setpoint. Resolves to canonical m³/s, then enters the latest-wins gate. Negative value = stop all (any unit). |
+| `child.register` | `registerChild` | `string` (Node-RED node id) | — | Register a child machine manually. Port 2 wiring does this automatically in normal flows. |
+
+### `set.demand` — unit-self-describing semantics
+
+`src/commands/handlers.js` `setDemand`. The payload itself decides the meaning:
+
+| Payload form | Interpretation |
+|:---|:---|
+| `42` (bare number) | 42 %. Mapped through `interpolation.interpolate_lin_single_point(value, 0, 100, dt.flow.min, dt.flow.max)` to a canonical m³/s, clamped to the dynamic envelope. |
+| `{value: 42, unit: '%'}` | Same as above — explicit-percent form. |
+| `{value: 80, unit: 'm3/h'}` (or `l/s` / `m3/s` / …) | Absolute flow. Converted via `convert(value).from(unit).to('m3/s')`. |
+| `42` or `{value: …, unit: 'm3/h'}` with `value < 0` | Triggers `turnOffAllMachines()` regardless of unit. |
+| Anything else (`NaN`, missing) | Logged at error level; dispatch is skipped. |
+
+There is **no persistent `scaling` state** on the orchestrator. Each `set.demand` carries its own unit context; callers can switch between absolute and percent at will.
+
+After a successful dispatch the handler replies on the input port with `{topic: <node.name>, payload: 'done'}` &mdash; the legacy "done" handshake some downstream flows still rely on.
+
+---
+
+## Data model &mdash; `getOutput()` shape
+
+Composed each tick by `src/io/output.js` `getOutput()` and emitted via `outputUtils.formatMsg` on Port 0. Delta-compressed: consumers see only the keys that changed.
+
+### Per-measurement keys
+
+For every `(type, variant)` MeasurementContainer pair, the formatter emits **up to four keys** &mdash; one per position plus a differential when both upstream and downstream are present:
+
+```
+<position>_<variant>_<type>
+```
+
+Examples (with `variant=predicted`, `type=flow`):
+
+| Key | Source |
+|:---|:---|
+| `downstream_predicted_flow` | Group aggregate at the discharge side. |
+| `atEquipment_predicted_flow` | Optimizer intent (what the controller's solving for). |
+| `upstream_predicted_flow` | Group suction-side aggregate (when populated). |
+| `differential_predicted_flow` | `downstream − upstream` when both legs read. |
+
+Same shape for `pressure`, `power`, `temperature`, `efficiency`, `Ncog`. Output units are taken from the unit policy (`flow=m3/h`, `pressure=mbar`, `power=kW`, `temperature=°C`).
+
+### Scalar group keys
+
+| Key | Type | Source | Notes |
+|:---|:---|:---|:---|
+| `mode` | string | `mgc.mode` | Current dispatch mode. |
+| `scaling` | (legacy) | `mgc.scaling` | Always `undefined` in the current code &mdash; the orchestrator no longer carries a scaling field. Kept in the formatter for now; will be removed. |
+| `absDistFromPeak` | number | `mgc.efficiency.calcDistanceBEP` | Absolute η distance to the group "peak" (mean of per-pump cogs). |
+| `relDistFromPeak` | number \| undefined | same | Normalised 0..1; `undefined` when the η spread collapses (homogeneous pump group). |
+| `headerDiffPa` | number | `mgc.operatingPoint.headerDiffPa` | Last header differential the equaliser resolved. Pa. |
+| `headerDiffMbar` | number | derived | Only emitted when `output.pressure === 'mbar'`. |
+| `flowCapacityMax` / `flowCapacityMin` | number | `mgc.dynamicTotals.flow.{max,min}` | The group's current envelope at the active header pressure. |
+| `machineCount` | number | `Object.keys(mgc.machines).length` | All registered children. |
+| `machineCountActive` | number | derived | Children whose state ≠ `off` / `maintenance` and currentMode ≠ `maintenance`. |
+
+### Status badge
+
+`src/io/output.js` `getStatusBadge()` composes:
+
+```
+<mode> · <scaling-abbrev> · Q=<flow>/<capacity> m³/h · P=<power> kW · <active>/<count>x
+```
+
+Fill colour: `green` when any pump is available, `yellow` when machines are registered but all are off/maintenance, `grey` when no pumps are registered.
+
+---
+
+## Configuration schema &mdash; editor form to config keys
+
+Source of truth: `generalFunctions/src/configs/machineGroupControl.json` plus `nodeClass.buildDomainConfig`.
+
+### General (`config.general`)
+
+| Form field | Config key | Default | Notes |
+|:---|:---|:---|:---|
+| Name | `general.name` | `Machine Group Configuration` | Human-readable label. |
+| (auto-assigned) | `general.id` | `null` | Node-RED node id; assigned at deploy. |
+| Default unit | `general.unit` | `m3/h` | Surfaces as the unit-policy output for `flow`. |
+| Enable logging | `general.logging.enabled` | `true` | Master logger switch. |
+| Log level | `general.logging.logLevel` | `info` | `debug` / `info` / `warn` / `error`. |
+
+### Functionality (`config.functionality`)
+
+| Form field | Config key | Default | Notes |
+|:---|:---|:---|:---|
+| Position vs parent | `functionality.positionVsParent` | `atEquipment` | One of `atEquipment` / `upstream` / `downstream`. Used in the child-register payload. |
+| (hidden) | `functionality.softwareType` | `machinegroupcontrol` | Constant. |
+| (hidden) | `functionality.role` | `GroupController` | Constant. |
+| Distance offset | `functionality.distance` | `null` | Optional spatial offset; populated from the editor when `hasDistance` is enabled. |
+| Distance unit | `functionality.distanceUnit` | `m` | |
+| Distance description | `functionality.distanceDescription` | `""` | Free-text. |
+
+### Output (`config.output`)
+
+| Form field | Config key | Default | Range | Notes |
+|:---|:---|:---|:---|:---|
+| Process Output | `output.process` | `process` | `process` / `json` / `csv` | Port-0 formatter. |
+| Database Output | `output.dbase` | `influxdb` | `influxdb` / `json` / `csv` | Port-1 formatter. |
+
+### Mode (`config.mode`)
+
+| Form field | Config key | Default | Range | Where used |
+|:---|:---|:---|:---|:---|
+| Control mode | `mode.current` | `optimalControl` | `optimalControl` / `priorityControl` / `maintenance` | dispatch switch in `_runDispatch`; mode-source/-action gates in `commands/handlers.js`. |
+| (defaults) | `mode.allowedActions.optimalControl` | `[statusCheck, execOptimalCombination, balanceLoad, emergencyStop]` | &mdash; | Enforced at command-handler entry via `specificClass.isValidActionForMode`. |
+| (defaults) | `mode.allowedActions.priorityControl` | `[statusCheck, execSequentialControl, balanceLoad, emergencyStop]` | &mdash; | Same. |
+| (defaults) | `mode.allowedActions.maintenance` | `[statusCheck]` | &mdash; | Same &mdash; dispatch/emergencyStop are dropped with a warn log. |
+| (defaults) | `mode.allowedSources.optimalControl` | `["parent","GUI","physical","API"]` | &mdash; | Enforced via `specificClass.isValidSourceForMode`. |
+| (defaults) | `mode.allowedSources.priorityControl` | `["parent","GUI","physical","API"]` | &mdash; | Same. |
+| (defaults) | `mode.allowedSources.maintenance` | `["parent","GUI"]` | &mdash; | Physical/HMI and API writes dropped in maintenance &mdash; monitoring only. |
+
+> [!NOTE]
+> `mode.current` is normalised at write time by `specificClass.setMode`: legacy lowercase inputs (`optimalcontrol`, `prioritycontrol`) are accepted and stored as the canonical camelCase. The `_runDispatch` switch then lowercases for its comparison &mdash; both forms reach the correct branch. Garbage modes (e.g. `'wat'`) are rejected with a warn log and the previous mode is preserved.
+>
+> Selecting `maintenance` no longer reaches `_runDispatch` at all in normal operation: the mode-action gate at `commands/handlers.js` drops the incoming `set.demand` before the dispatcher sees it. Status messages (`set.mode`, `child.register`) continue to flow.
+
+### Unit policy
+
+Source: `src/specificClass.js` lines 33&ndash;37.
+
+| Quantity | Canonical (internal) | Output (rendered) | Required-unit |
+|:---|:---|:---|:---:|
+| Flow | `m3/s` | `m3/h` | ✓ |
+| Pressure | `Pa` | `mbar` | ✓ |
+| Power | `W` | `kW` | ✓ |
+| Temperature | `K` | `°C` | ✓ |
+
+`requireUnitForTypes` means MeasurementContainer rejects writes without an explicit unit for these types &mdash; protects against accidentally writing raw numbers in the wrong scale.
+
+---
+
+## Child registration
+
+Source: `src/specificClass.js` `configure()` lines 92&ndash;118.
+
+| softwareType | Filter / subscribed events | Side-effect |
+|:---|:---|:---|
+| `machine` | `onRegister` stores the child in `this.machines[id]`. Subscribes to `pressure.measured.downstream`, `pressure.measured.differential`, and `flow.predicted.downstream` from the child's emitter. | Every event calls `handlePressureChange()` &mdash; equalises the header, recomputes dynamic totals, refreshes group η, fires `notifyOutputChanged()`. |
+| `measurement` | `onRegister` reads `asset.type` and `positionVsParent`, subscribes to `<type>.measured.<position>` on the child's measurement emitter. | Mirrors the value into MGC's own MeasurementContainer; pressure values additionally trigger `handlePressureChange()`. |
+
+A child whose `asset.type` or `positionVsParent` is missing is logged at warn and skipped (not registered).
+
+There is **no filter on `machinegroup` / `pumpingstation` children** &mdash; MGC is a leaf controller; it parents pumps but doesn't accept fellow aggregators.
+
+---
+
+## Header-pressure equalisation
+
+Source: `src/groupOps/groupOperatingPoint.js` `equalize()`.
+
+MGC ensures every registered child uses the **same** header differential pressure when computing predicted flow / power. Algorithm:
+
+1. Read MGC's own group-scope pressure (downstream and upstream) from its MeasurementContainer.
+2. Read each child's measured pressure (downstream / upstream).
+3. Pick:
+   - `headerDownstream` = group reading if positive, else `max` across children.
+   - `headerUpstream` = group reading if positive, else `min` across children.
+4. If the differential is non-positive, skip the equalisation (debug log).
+5. Stash the diff on `this.headerDiffPa` (used by `getOutput` and by every η computation).
+6. Push the diff onto each child's `predictFlow.fDimension` / `predictPower.fDimension` / `predictCtrl.fDimension` &mdash; preferred path is `child.setGroupOperatingPoint(downstream, upstream)`, which lets the child re-build its `groupPredict*` interpolators. Older children fall back to a direct `fDimension` write.
+
+The equaliser is called from `handlePressureChange` (on every child pressure / predicted-flow event) and from the start of `_optimalControl`.
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference &mdash; Architecture](Reference-Architecture) | Code map, dispatch lifecycle, planner internals |
+| [Reference &mdash; Examples](Reference-Examples) | Shipped flows |
+| [Reference &mdash; Limitations](Reference-Limitations) | Known issues and open questions |
+| [EVOLV &mdash; Topic Conventions](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topic-Conventions) | Platform-wide topic rules |
+| [EVOLV &mdash; Telemetry](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Telemetry) | Port 0 / 1 / 2 InfluxDB layout |

wiki/Reference-Examples.md

@@ -0,0 +1,155 @@
+# Reference — Examples
+
+![code-ref](https://img.shields.io/badge/code--ref-26e92b5-blue)
+
+> [!NOTE]
+> Every example flow shipped under `nodes/machineGroupControl/examples/`, plus how to load them, what they show, and the debug recipes that go with them. Live source: `nodes/machineGroupControl/examples/`.
+
+---
+
+## Shipped examples
+
+| File | Tier | What it shows |
+|:---|:---:|:---|
+| `examples/01-Basic.json` | 1 | One MGC + three `rotatingMachine` pumps driven by inject buttons. A Setup group once-fires `virtualControl` + `cmd.startup` on all three pumps; mode / demand are then driven by buttons. |
+| `examples/02-Dashboard.json` | 2 | Same command surface driven by a FlowFuse Dashboard 2.0 page — mode buttons, demand slider, live status rows (mode / total flow / total power / capacity / active machines / BEP %), trend charts, and a raw-output table. |
+
+MGC is not a standalone node — it needs at least one `rotatingMachine` child to dispatch to. Both flows ship three child pumps.
+
+---
+
+## Loading a flow
+
+### Via the editor
+
+1. Open the Node-RED editor at `http://localhost:1880`.
+2. Menu → Import.
+3. Drag-and-drop the JSON file, or paste its contents.
+4. Click Deploy.
+
+### Via the Admin API
+
+```bash
+curl -X POST -H 'Content-Type: application/json' \
+  --data @nodes/machineGroupControl/examples/01-Basic.json \
+  http://localhost:1880/flows
+```
+
+---
+
+## Example 01 — Basic standalone
+
+> [!IMPORTANT]
+> **Screenshot needed.** Capture of the basic flow in the editor. Save as `wiki/_partial-screenshots/machineGroupControl/01-basic-flow.png`. Replace this callout with the image link.
+
+### Nodes on the tab
+
+| Type | Purpose |
+|:---|:---|
+| `comment` | Tab header / instructions / driver-group labels |
+| `inject` | Setup auto-injects (virtualControl + cmd.startup per pump), mode buttons, demand-by-percent buttons, demand-by-absolute-unit buttons, stop-all button |
+| `machineGroupControl` | The unit under test |
+| `rotatingMachine` × 3 | Children A / B / C (each with its own simulated pressure pair) |
+| `debug` | Port 0 (process), Port 1 (telemetry), Port 2 (registration) per node |
+
+### What to do after deploy
+
+1. Wait ~1.5 s. The Setup group auto-fires `virtualControl` + `cmd.startup` on all three pumps.
+2. Click `set.demand = 50` (bare number = percent). MGC selects the best combination via BEP-Gravitation, plans a rendezvous, and dispatches `flowmovement` to the selected pumps.
+3. Click `set.demand = 100`. The optimizer probably engages a third pump; the planner schedules its `execsequence(startup)` at tick 0 and delays the running pumps' down-moves so they all hit their new targets together at `t*`.
+4. Click `set.mode = priorityControl`. Subsequent demands route through `equalFlowControl` — equal-flow per active pump in priority order. (Planner is bypassed in this mode — see [Limitations](Reference-Limitations).)
+5. Click `set.demand = {value: 80, unit: 'm3/h'}` (or use the absolute-unit button). Same path, but the percent-mapping step is skipped — the value lands on the gate as canonical m³/s directly.
+6. Click `set.demand = -1`. `turnOffAllMachines` runs: cancels any parked demand, sends `execsequence: 'shutdown'` to every active pump.
+
+> [!IMPORTANT]
+> **GIF needed.** Demo of steps 1–6 with the live status panel. Save as `wiki/_partial-gifs/machineGroupControl/01-basic-demo.gif`, target ≤ 1 MB after `gifsicle -O3 --lossy=80`.
+
+---
+
+## Example 02 — Dashboard
+
+> [!IMPORTANT]
+> **Screenshots needed.** Two captures from `02-Dashboard.json`:
+> 1. The editor tab (left controls column + MGC + 3 pumps + dashboard widget cluster on the right).
+> 2. The rendered dashboard at `http://localhost:1880/dashboard/mgc-basic`.
+>
+> Save as `wiki/_partial-screenshots/machineGroupControl/02-dashboard-editor.png` and `03-dashboard-rendered.png`. Replace this callout with both image links.
+
+### What it adds vs Example 01
+
+| Addition | Why |
+|:---|:---|
+| FlowFuse `ui-base` + `ui-theme` + `ui-page` setup | One dashboard page hosting four widget groups |
+| `ui-button` cluster (Controls) | Mode buttons, `Initialize pumps`, `Stop all` |
+| `ui-slider` (Demand) | Drag-to-set demand; passes through the same canonical `set.demand` topic the injects use |
+| `ui-text` cluster (Status) | Mode / total flow / total power / capacity / active machines / BEP % rows |
+| `ui-chart` × N (Trends) | Flow, power, BEP trends over time |
+| `ui-template` (Raw output) | Full key/value table of the latest Port 0 payload |
+| Fan-out function | Caches last-known values so delta-only Port 0 updates never blank a status row, and forwards numeric values to charts |
+
+The dashboard buttons fire the **same canonical `msg.topic`** as the inject nodes in Example 01 — there is no separate dashboard command surface to learn.
+
+Required: `@flowfuse/node-red-dashboard` (Dashboard 2.0) installed in the Node-RED instance.
+
+### What to do after deploy
+
+1. Open `http://localhost:1880/dashboard/mgc-basic`.
+2. The page auto-initialises the pumps; the `Initialize pumps` button re-runs the setup manually.
+3. Drag the **Demand** slider. The Status row's `total flow` and `BEP %` react; the trend charts plot the transition.
+4. Switch modes. The mode row in Status reflects the change immediately.
+5. Inspect the **Raw output** table for the full Port-0 surface — `headerDiffPa`, `flowCapacityMax`, `machineCountActive`, `relDistFromPeak`, …
+
+> [!IMPORTANT]
+> **GIF needed.** Capture clicking through demand 30 % → 80 % → -1 with the trends reacting. 30–45 s is enough.
+>
+> Save as `wiki/_partial-gifs/machineGroupControl/02-dashboard-demo.gif`. Replace this callout with the image link.
+
+---
+
+## Docker compose snippet
+
+To bring up Node-RED + InfluxDB with EVOLV nodes pre-loaded:
+
+```yaml
+# docker-compose.yml (extract)
+services:
+  nodered:
+    build: ./docker/nodered
+    ports: ['1880:1880']
+    volumes:
+      - ./docker/nodered/data:/data/evolv
+  influxdb:
+    image: influxdb:2.7
+    ports: ['8086:8086']
+```
+
+Full file: [EVOLV/docker-compose.yml](https://gitea.wbd-rd.nl/RnD/EVOLV/src/branch/development/docker-compose.yml).
+
+---
+
+## Debug recipes
+
+| Symptom | First thing to check | Where to look |
+|:---|:---|:---|
+| `mode is not a valid mode` warns every dispatch | `mode.current` is `maintenance` (or a typo). Reset to `optimalControl` or `priorityControl`. | `_runDispatch` switch. |
+| `No valid combination found (empty set)` | Demand outside the dynamic envelope, OR every child filtered out (state in `off / coolingdown / stopping / emergencystop` or `auto`-mode rejects the action). | `validPumpCombinations` + state of each child. |
+| Group flow stuck at zero after `set.demand` | Pumps never reached an active state — check per-pump startup logs. | Each pump's `state` on its Port 0. |
+| Pump warmingup, but then drops back to idle when demand keeps changing | Pre-2026-05-15 race condition: shutdown's for-loop barged through after a residue-handler operational transition. The fix is the `sequenceAbortToken` mechanism in rotatingMachine's FSM. Verify the rotatingMachine submodule is at `394a972` or newer. | rotatingMachine `state/sequenceController.js`. |
+| Header pressure not equalising | Pressure children must register with `asset.type='pressure'` and a matching `positionVsParent`. Pure-numeric pressures with no unit are rejected by MeasurementContainer. | `operatingPoint.equalize`. |
+| Optimiser picks unexpected combination | Verify `optimization.method` — default is `BEP-Gravitation-Directional`. Per-method scoring lives in `optimizer/`. | `optimizer/{bestCombination, bepGravitation}.js`. |
+| Status badge shows `scaling=norm` even after a unit-tagged demand | Badge cosmetic only — the `scaling` field is a legacy artifact and currently always reads `norm`. The dispatch path is unit-self-describing. | `io/output.js` `getStatusBadge`. |
+| Per-pump flow / power trends missing | MGC only emits group aggregates on Port 0. Subscribe to each `rotatingMachine`'s Port 0 if you need per-pump series. | `io/output.js` `getOutput`. |
+
+> Never ship `enableLog: 'debug'` in a demo — fills the container log within seconds and obscures real errors.
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference — Contracts](Reference-Contracts) | Topic + config + child filters |
+| [Reference — Architecture](Reference-Architecture) | Code map, dispatch lifecycle, planner internals |
+| [Reference — Limitations](Reference-Limitations) | Known issues and open questions |
+| [EVOLV — Topology Patterns](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topology-Patterns) | Where this node fits in a larger plant |

wiki/Reference-Limitations.md

@@ -0,0 +1,128 @@
+# Reference — Limitations
+
+![code-ref](https://img.shields.io/badge/code--ref-26e92b5-blue)
+
+> [!NOTE]
+> What `machineGroupControl` does not do, current rough edges, and open questions. The planner-decline question is tracked as Gitea issue `RnD/machineGroupControl#1`; other open items live in `.agents/improvements/IMPROVEMENTS_BACKLOG.md` in the superproject.
+
+---
+
+## When you would not use this node
+
+| Scenario | Use instead |
+|:---|:---|
+| A single pump | Wire `rotatingMachine` directly under your parent. MGC's combinatorics + totals add no value below N=2. |
+| Valves (no curve, no FSM-driven motor) | `valveGroupControl`. MGC's optimizer assumes a flow-vs-pressure characteristic. |
+| Pumps behind independent headers | Multiple MGCs (one per header), each parented to its own logical aggregator. The equaliser assumes a shared discharge / suction pressure. |
+| Curve-less assets | Without a curve, `optimalControl` excludes the machine from every combination; the dispatch loop falls into the empty-set branch and warns each tick. |
+| Mixed compressor + pump groups | The optimizer is curve-agnostic in principle, but the η = (Q·ΔP)/P_shaft identity used in `_optimalControl` assumes an incompressible-flow head. Use separate MGCs per phase. |
+
+---
+
+## Known limitations
+
+### `maintenance` mode is in the schema but not in the dispatch switch
+
+`config.mode.current` accepts `maintenance` as a valid value (per the schema enum), but `_runDispatch`'s mode switch only handles `optimalcontrol` and `prioritycontrol`. Picking `maintenance` will log `'maintenance' is not a valid mode.` on every demand. Treated as schema-vs-code drift, not a runtime bug.
+
+### `priorityControl` bypasses the movement planner
+
+`equalFlowControl` (the priority-mode strategy) still uses the legacy direct-dispatch path:
+
+```js
+await Promise.all(flowDistribution.map(async ({ machineId, flow }) => {
+    if (flow > 0) {
+        await machine.handleInput('parent', 'flowmovement', ...);
+        if (currentState === 'idle') await machine.handleInput('parent', 'execsequence', 'startup');
+    } else { ... shutdown ... }
+}));
+```
+
+The planner is only wired through `optimalControl`. Consequence: priority-mode transitions can show a flow dip while one pump warms up and another keeps spinning. Tracked for a future pass; the planner's API is mode-agnostic so the surgery is straightforward when priorities allow.
+
+### `mgc.scaling` is undefined
+
+The orchestrator no longer carries a `scaling` field — `set.demand` is unit-self-describing per message. The `io/output.js` formatter still references `mgc.scaling`, which always reads `undefined`. The status-badge cosmetically displays `norm`. This is a leftover artifact of the pre-refactor design; harmless, scheduled for removal.
+
+### Group efficiency naming — `maxEfficiency` is the **mean**, not the peak
+
+`GroupEfficiency.calcGroupEfficiency` returns `{ maxEfficiency, lowestEfficiency }`. `maxEfficiency` is the **mean cog** across all machines, not the maximum. The name is preserved for behavioural parity with the pre-refactor code; callers using it as "the peak" will over-estimate the BEP target. Tracked — rename is a follow-up.
+
+### `calcAbsoluteTotals` implicit pressure coupling
+
+`TotalsCalculator.calcAbsoluteTotals` iterates a machine's `predictFlow.inputCurve` and re-indexes the SAME pressure key into `predictPower.inputCurve`. If the two curves were sampled at different pressures the lookup is `undefined` and the call throws. Mitigation deferred to the rotatingMachine curveLoader pass (P5).
+
+### Power-cap parameter has no canonical topic
+
+`handleInput(source, demand, powerCap)` accepts a `powerCap` argument and threads it to `validPumpCombinations`, but there is no `set.power-cap` topic in `commands/index.js`. Only programmatic callers can set it. Tracked.
+
+### Per-pump fan-out not on Port 0
+
+MGC's Port 0 carries the group aggregate only (`atEquipment_predicted_flow`, `headerDiffPa`, etc.). If you want per-pump trends on a dashboard you must wire each `rotatingMachine`'s Port 0 separately. By design — the alternative would put N × M fields on the MGC payload.
+
+### Curve-less members silently drop out
+
+`combinatorics/pumpCombinations.validPumpCombinations` filters by FSM state and mode but not by curve presence. A machine with `predictFlow === null` (because its curve loader failed at startup) has `currentFxyYMin / Max = 0`, so its contribution to subset envelopes is zero. It can still appear in subsets — the optimizer just gives it zero flow. The drop-out is silent; the only signal is the curve-loader's error log at startup.
+
+---
+
+## Open questions (tracked)
+
+| Question | Where it lives |
+|:---|:---|
+| Should the planner ever decline a combination when the slowest startup exceeds an SLA on demand spikes? | [machineGroupControl#1](https://gitea.wbd-rd.nl/RnD/machineGroupControl/issues/1) |
+| Wire the movement planner through `priorityControl` | Internal — not yet ticketed |
+| Remove the `mgc.scaling` artifact + the `scaling` badge field | Internal |
+| Rename `maxEfficiency` → `meanGroupCog` in `GroupEfficiency` | Internal |
+| Decline-and-fall-back vs always-commit on planner level | Same as the Gitea issue above |
+
+---
+
+## Migration notes
+
+### From pre-planner
+
+The MGC's `_optimalControl` used to fan commands out inline (lines 226–239 in `26e92b5^`):
+
+```js
+await Promise.all(Object.entries(this.machines).map(async ([id, machine]) => {
+    if (flow > 0) {
+        await machine.handleInput('parent', 'flowmovement', ...);
+        if (state === 'idle') await machine.handleInput('parent', 'execsequence', 'startup');
+    } else if (ACTIVE_STATES.has(state)) {
+        await machine.handleInput('parent', 'execsequence', 'shutdown');
+    }
+}));
+```
+
+That code is gone. The new path: build profiles → `scheduler.plan` → `executor.replan` → `await executor.tick()` (synchronous first tick) → `setInterval(1000)` for the rest. The flow / power numbers and the optimizer's pick are unchanged; only the **timing** of the per-pump commands changed.
+
+If your test fixture relied on commands firing inline during `_runDispatch`, the new behaviour fires `fireAtTickN=0` commands synchronously inside the first `await executor.tick()` and later ones on the wall-clock interval. Tests that asserted exact timing should use the `executor.schedule()` introspection getter.
+
+### From pre-unit-self-describing demand
+
+The old `set.scaling` topic and its persistent `scaling.current` config field have been removed. Each `set.demand` now carries its own unit context:
+
+| Pre | Post |
+|:---|:---|
+| `set.scaling = "absolute"`; `set.demand = 80` | `set.demand = {value: 80, unit: "m3/h"}` |
+| `set.scaling = "normalized"`; `set.demand = 50` | `set.demand = 50` (bare number = %) |
+| `set.scaling = "absolute"`; `set.demand = 0.022` (m³/s) | `set.demand = {value: 0.022, unit: "m3/s"}` |
+
+Old flows that still send `set.scaling` will silently ignore it; the topic is no longer registered.
+
+### From `prioritypercentagecontrol`
+
+The mode `prioritypercentagecontrol` was retired with the unit-self-describing refactor. Use `priorityControl` with absolute-unit `set.demand` payloads, or `optimalControl` with the same.
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference — Contracts](Reference-Contracts) | Topic + config + child filters |
+| [Reference — Architecture](Reference-Architecture) | Code map, dispatch lifecycle, planner internals |
+| [Reference — Examples](Reference-Examples) | Shipped flows + debug recipes |
+| [rotatingMachine — Limitations](https://gitea.wbd-rd.nl/RnD/rotatingMachine/wiki/Reference-Limitations) | The child's own limitations (drift, multi-parent, virtual-child stale data) |

wiki/_Sidebar.md

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+### machineGroupControl
+
+- [Home](Home)
+
+**Reference**
+
+- [Contracts](Reference-Contracts)
+- [Architecture](Reference-Architecture)
+- [Examples](Reference-Examples)
+- [Limitations](Reference-Limitations)
+
+**Related**
+
+- [EVOLV master wiki](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Home)
+- [rotatingMachine wiki](https://gitea.wbd-rd.nl/RnD/rotatingMachine/wiki/Home)
+- [pumpingStation wiki](https://gitea.wbd-rd.nl/RnD/pumpingStation/wiki/Home)
+- [Topology Patterns](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topology-Patterns)
+- [Topic Conventions](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topic-Conventions)
+- [Telemetry](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Telemetry)