All 5 new message types (event, alert, ble_scan, trigger_state,
system_health) were already implemented in hub.go with broadcast methods,
called from main.go/ingestion/volume_triggers/events, and handled in
app.js. Also includes security mode persistence from anomaly DB and
OpenAPI docs for triggers endpoints.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
