P11.5 + B2.1/B2.2: per-command units + description (where applicable)

Adds  to scalar setters whose payloads are
plain numbers OR {value, unit}. Skipped where payload is compound or
mode-dependent (control-%, {F, C: [...]}, etc.) — documented inline.
Every command gains a description field for wikiGen consumption.

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

src/commands/index.js

@@ -12,12 +12,14 @@ module.exports = [
     topic: 'set.mode',
     aliases: ['setMode'],
     payloadSchema: { type: 'string' },
+    description: 'Switch the machine group between auto / manual modes.',
     handler: handlers.setMode,
   },
   {
     topic: 'set.scaling',
     aliases: ['setScaling'],
     payloadSchema: { type: 'string' },
+    description: 'Select the group scaling strategy.',
     handler: handlers.setScaling,
   },
   {
@@ -25,6 +27,7 @@ module.exports = [
     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,
   },
   {
@@ -32,6 +35,8 @@ module.exports = [
     aliases: ['Qd'],
     // any: number or numeric string — handler runs parseFloat.
     payloadSchema: { type: 'any' },
+    units: { measure: 'volumeFlowRate', default: 'm3/h' },
+    description: 'Operator demand setpoint dispatched to the child machines.',
     handler: handlers.setDemand,
   },
 ];