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

@@ -68,6 +68,18 @@ from the measurement container (e.g. `delta_predicted_pressure`,
   (`idle → starting → warmingup → operational → accelerating →
   decelerating → stopping → coolingdown → idle`, plus `off`).
 
+## Limitations vs `rotatingMachine`
+
+- **No `maintenance` state machine.** The schema's `mode.current` enum
+  accepts `maintenance` (gates sources via `isValidSourceForMode`), but
+  the FSM has no `entermaintenance` / `exitmaintenance` states and the
+  `sequences` schema declares only `startup`, `shutdown`, `emergencystop`,
+  and `boot`. Configuring `maintenance` mode therefore disables external
+  command sources but does not put the valve through a maintenance
+  sequence. Aligns with valve's role as a passive flow-controlled
+  actuator; lift to RM-style FSM if/when site maintenance procedures
+  require explicit state transitions.
+
 ## Events emitted by `source.measurements.emitter`
 
 The `MeasurementContainer` fires `<type>.<variant>.<position>` whenever

valve.html

@@ -14,7 +14,7 @@
 <script>
   RED.nodes.registerType("valve", {
     category: "EVOLV",
-    color: "#86bbdd", // color for the node based on the S88 schema
+    color: "#3CAEA3",
     defaults: {
 
       // Define default properties
@@ -131,6 +131,7 @@
     <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>