FN-5890: include task description in ntfy task-created notifications

Ensure agent-created ntfy notifications fall back to the task description when the title is still empty.

- pass task descriptions through task-created notification payloads
- cover empty-title task creation in notification service tests
- verify ntfy task-created messages render the id+description fallback
- add a patch changeset for the published CLI package

Files changed:
 .changeset/fn-5890-task-created-title.md                 |  5 +++++
 .../engine/src/__tests__/notification-service.test.ts    | 12 +++++++++++-
 packages/engine/src/__tests__/ntfy-provider.test.ts      | 16 ++++++++++++++++
 packages/engine/src/notification/notification-service.ts |  1 +
 4 files changed, 33 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-5890

Fusion-Task-Lineage: 4a67a4d0-c3a8-4923-a506-7a67a8836127

packages/engine/src/__tests__/notification-service.test.ts

@@ -126,12 +126,22 @@ describe("NotificationService", () => {
       service.registerProvider(provider);
       await service.start();
 
-      store.emit("task:created", task({ id: "FN-201", sourceAgentId: "agent-1", sourceType: "agent_heartbeat" as any }));
+      store.emit(
+        "task:created",
+        task({
+          id: "FN-201",
+          title: "",
+          description: "Investigate the notification payload fallback",
+          sourceAgentId: "agent-1",
+          sourceType: "agent_heartbeat" as any,
+        }),
+      );
       await vi.waitFor(() => {
         expect(sendNotification).toHaveBeenCalledWith(
           "task-created",
           expect.objectContaining({
             taskId: "FN-201",
+            taskDescription: "Investigate the notification payload fallback",
             event: "task-created",
             metadata: expect.objectContaining({ sourceAgentId: "agent-1", agentName: "Triage Bot" }),
           }),

packages/engine/src/__tests__/ntfy-provider.test.ts

@@ -135,6 +135,22 @@ describe("NtfyNotificationProvider", () => {
     );
   });
 
+  it("renders task-created with description fallback when title is empty", async () => {
+    await provider.sendNotification("task-created" as any, {
+      taskId: "FN-1",
+      taskTitle: "",
+      taskDescription: "Investigate the notification payload fallback",
+      event: "task-created" as any,
+      metadata: { agentName: "Triage Bot" },
+    });
+
+    expect(mocks.sendNtfyNotificationWithResult).toHaveBeenCalledWith(
+      expect.objectContaining({
+        message: expect.stringContaining('Triage Bot created "FN-1: Investigate the notification payload fallback"'),
+      }),
+    );
+  });
+
   it("builds click URL from config for task message events", async () => {
     await provider.sendNotification("message:agent-to-user" as any, {
       taskId: "FN-1",

packages/engine/src/notification/notification-service.ts

@@ -179,6 +179,7 @@ export class NotificationService {
     this.maybeNotify(task.id, "task-created", {
       taskId: task.id,
       taskTitle: task.title,
+      taskDescription: task.description,
       event: "task-created",
       metadata: {
         sourceAgentId,