style: palette swatch → (domain-hue redesign 2026-05-21)

Sidebar swatch now follows function family rather than S88 level, so the
palette is visually identifiable instead of monochromatically blue. Editor-group
rectangles in flow.json still follow S88 — only the registerType color changed.
Full table + rationale: superproject .claude/rules/node-red-flow-layout.md §10.0
and .claude/refactor/OPEN_QUESTIONS.md (2026-05-21 entry).

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

CONTRACT.md

@@ -8,10 +8,9 @@ Hand-maintained for Phase 6; the `## Inputs` table is generated from
 | Canonical | Aliases (deprecated) | Payload | Effect |
 |---|---|---|---|
 | `data.influent` | `influent`, `setInfluent` | `{ F: number, C: number[13] }` — either field optional | Replaces influent flow and/or the 13-species concentration vector. Triggers `output-changed`, re-emits the 3-stream Fluent envelope. |
+| `child.register` | `registerChild` | `string` — the child node's Node-RED id | Resolves the child via `RED.nodes.getNode` and registers it through `childRegistrationUtils` at the supplied `msg.positionVsParent`. |
 
 Aliases log a one-time deprecation warning the first time they fire.
-Plumbing topics (`child.register`) are handled by the BaseNodeAdapter and
-not listed here.
 
 ## Outputs
 

settler.html

@@ -3,7 +3,7 @@
 <script type="text/javascript">
   RED.nodes.registerType("settler", {
     category: "EVOLV",
-    color: "#e4a363",
+    color: "#8FAD3F",
     defaults: {
       name: { value: "" },
       processOutputFormat: { value: "process" },
@@ -70,6 +70,7 @@
     <label for="node-input-dbaseOutputFormat"><i class="fa fa-database"></i> Database Output</label>
     <select id="node-input-dbaseOutputFormat" style="width:60%;">
       <option value="influxdb">influxdb</option>
+      <option value="frost">frost</option>
       <option value="json">json</option>
       <option value="csv">csv</option>
     </select>

wiki/Reference-Contracts.md

@@ -13,12 +13,12 @@ Full topic contract, configuration schema, and child-registration filters for `s
 
 The registry lives in `src/commands/index.js`. Each descriptor maps a canonical `msg.topic` to its handler; aliases emit a one-time deprecation warning the first time they fire.
 
-<!-- BEGIN AUTOGEN: topic-contract — populate via wiki-gen tool (TODO) -->
+<!-- BEGIN AUTOGEN: topic-contract -->
 
 | Canonical topic | Aliases | Payload | Unit | Effect |
-|:---|:---|:---|:---|:---|
-| `data.influent` | `influent`, `setInfluent` | `{F: number, C: number[13]}` &mdash; either field optional | `F` in m³/h, `C[*]` in mg/L | Replaces influent flow and/or the 13-species concentration vector on the domain (`source.F_in`, `source.Cs_in`). Triggers `notifyOutputChanged`, which re-emits the 3-stream Fluent envelope on Port 0. |
-| `child.register` | `registerChild` | `string` (child node id) | &mdash; | Register a child node (measurement / reactor / machine) with this settler. Port 2 wiring does this automatically in normal flows; the explicit handler exists because `BaseNodeAdapter` does not have an implicit registration path. |
+|---|---|---|---|---|
+| `data.influent` | `influent`, `setInfluent` | any | — | Push the influent stream (payload: {F: flow m3/h, C: [concentrations mg/L]}). |
+| `child.register` | `registerChild` | `string` | — | Register a child node (typically a measurement) with this settler. |
 
 <!-- END AUTOGEN: topic-contract -->