feat(FN-4178): add room message notification delivery

This merge implements room message notifications across the system, adding a core room event type, wiring the notification dispatcher to room activity, and delivering notifications via ntfy and webhook providers with updated settings UI and API routes.

Fusion-Task-Id: FN-4178

packages/core/src/__tests__/global-settings.test.ts

@@ -344,6 +344,7 @@ describe("GlobalSettingsStore", () => {
         "planning-awaiting-input",
         "message:agent-to-user",
         "message:agent-to-agent",
+        "message:room",
         "gridlock",
         "fallback-used",
         "memory-dreams-processed",

packages/core/src/__tests__/notification-dispatcher.test.ts

@@ -154,6 +154,7 @@ describe("NotificationDispatcher", () => {
       "planning-awaiting-input",
       "message:agent-to-user",
       "message:agent-to-agent",
+      "message:room",
       "gridlock",
       "fallback-used",
       "memory-dreams-processed",

packages/core/src/settings-schema.ts

@@ -33,6 +33,7 @@ export const DEFAULT_GLOBAL_SETTINGS = {
     "planning-awaiting-input",
     "message:agent-to-user",
     "message:agent-to-agent",
+    "message:room",
     "gridlock",
     "fallback-used",
     "memory-dreams-processed",

packages/core/src/types.ts

@@ -258,7 +258,8 @@ export type NtfyNotificationEvent =
   | "fallback-used"
   | "memory-dreams-processed"
   | "message:agent-to-user"
-  | "message:agent-to-agent";
+  | "message:agent-to-agent"
+  | "message:room";
 
 /** Known notification event types. Providers may support additional custom events. */
 export const NOTIFICATION_EVENTS = [
@@ -273,6 +274,7 @@ export const NOTIFICATION_EVENTS = [
   "memory-dreams-processed",
   "message:agent-to-user",
   "message:agent-to-agent",
+  "message:room",
 ] as const;
 
 /** Notification event type. Known events plus provider-specific custom events. */