phase 9 notification toggles (per-alert, per-category, master; default-disabled)

services/notificationRegistry.js

@@ -1,19 +1,18 @@
 /**
  * Canonical notification alert registry.
  *
- * Single source of truth for the 30 standard-threshold-driven alert keys used
- * across surgeChecker, patternChecker, and staffNotifications. Consumed by:
- *   - the three checker services (startup drift-check)
+ * Single source of truth for the 32 registered alert keys across surgeChecker,
+ * patternChecker, staffNotifications, and chatAlertChecker. Consumed by:
+ *   - the checker services (startup drift-check, Phase 9 enable gating)
  *   - routes/internalApi.js GET /notifications/alerts
  *   - settings-site UI (via proxied /api/notifications/alerts, with fallback)
  *
  * Not covered here (intentionally fallback-only in the UI):
- *   - rapid_t2_t3        — uses count-milestone firing, not shouldFire()
- *   - chat_messages/time — owned by chatAlertChecker.js, out of Phase 5 scope
+ *   - rapid_t2_t3 — uses count-milestone firing, not shouldFire()
  *
  * `windowType` is the reset window used by shouldFire() for pattern keys
- * (today/week/month). For surge and unclaimed, firing is cooldown-escalating
- * rather than window-based, so windowType is null.
+ * (today/week/month). For surge, unclaimed, and chat, firing is
+ * cooldown-escalating rather than window-based, so windowType is null.
  */
 
 const REGISTRY = Object.freeze({
@@ -174,13 +173,27 @@ const REGISTRY = Object.freeze({
       description: 'Reminds all staff notification channels about unclaimed tickets. Thresholds are per-ticket age — each threshold fires once per ticket and resets on escalation.',
       windowType: null
     })
+  ]),
+
+  chat: Object.freeze([
+    Object.freeze({
+      key: 'chat_messages',
+      description: 'Fires when pending user message volume in monitored chat channels crosses configured count thresholds without staff replies.',
+      windowType: null
+    }),
+    Object.freeze({
+      key: 'chat_time',
+      description: 'Fires when a monitored chat channel has had no staff response for the given duration with pending user messages. Resets when staff responds.',
+      windowType: null
+    })
   ])
 });
 
 const ALL_KEYS = Object.freeze([
   ...REGISTRY.surge.map(e => e.key),
   ...REGISTRY.patterns.map(e => e.key),
-  ...REGISTRY.unclaimed.map(e => e.key)
+  ...REGISTRY.unclaimed.map(e => e.key),
+  ...REGISTRY.chat.map(e => e.key)
 ]);
 
 const ALL_KEYS_SET = new Set(ALL_KEYS);