P6: convert dashboardAPI to platform infrastructure

Refactor of dashboardAPI to use BaseNodeAdapter + commandRegistry + statusBadge.
dashboardAPI follows the platform refactor plan in .claude/refactor/MODULE_SPLIT.md.
Tests stay green; CONTRACT.md generated; legacy aliases preserved.

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

src/commands/index.js

@@ -0,0 +1,16 @@
+'use strict';
+
+// dashboardAPI command registry. Canonical names follow CONTRACTS.md §1.
+// The legacy `registerChild` topic is kept as an alias of `child.register`
+// (Phase 1 canonical) and logs a one-time deprecation warning on first use.
+
+const handlers = require('./handlers');
+
+module.exports = [
+  {
+    topic: 'child.register',
+    aliases: ['registerChild'],
+    payloadSchema: { type: 'any' },
+    handler: handlers.registerChild,
+  },
+];