docs(FN-3887): clarify ntfy allowlist requirement for agent messages

- Update settings reference language for ntfy integration
- Clarify that agent messages require allowlisting configuration
- Keep notification setup guidance aligned with current behavior

Fusion-Task-Id: FN-3887

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

@@ -324,6 +324,8 @@ describe("GlobalSettingsStore", () => {
         "awaiting-approval",
         "awaiting-user-review",
         "planning-awaiting-input",
+        "message:agent-to-user",
+        "message:agent-to-agent",
         "gridlock",
         "fallback-used",
         "memory-dreams-processed",

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

@@ -152,6 +152,8 @@ describe("NotificationDispatcher", () => {
       "awaiting-approval",
       "awaiting-user-review",
       "planning-awaiting-input",
+      "message:agent-to-user",
+      "message:agent-to-agent",
       "gridlock",
       "fallback-used",
       "memory-dreams-processed",

packages/core/src/settings-schema.ts

@@ -30,6 +30,8 @@ export const DEFAULT_GLOBAL_SETTINGS = {
     "awaiting-approval",
     "awaiting-user-review",
     "planning-awaiting-input",
+    "message:agent-to-user",
+    "message:agent-to-agent",
     "gridlock",
     "fallback-used",
     "memory-dreams-processed",