fix: prevent isolated watchers from blocking chat

src/task-scheduler.test.ts

@@ -106,9 +106,52 @@ describe('task scheduler', () => {
     await vi.advanceTimersByTimeAsync(10);
 
     expect(enqueueTask).toHaveBeenCalledTimes(1);
+    expect(enqueueTask.mock.calls[0][0]).toBe('shared@g.us::task:task-codex');
     expect(enqueueTask.mock.calls[0][1]).toBe('task-codex');
   });
 
+  it('keeps group-context tasks on the chat queue key', async () => {
+    const dueAt = new Date(Date.now() - 60_000).toISOString();
+    createTask({
+      id: 'task-group-context',
+      group_folder: 'shared-group',
+      chat_jid: 'shared@g.us',
+      agent_type: 'codex',
+      prompt: 'group context task',
+      schedule_type: 'once',
+      schedule_value: dueAt,
+      context_mode: 'group',
+      next_run: dueAt,
+      status: 'active',
+      created_at: '2026-02-22T00:00:00.000Z',
+    });
+
+    const enqueueTask = vi.fn();
+
+    startSchedulerLoop({
+      serviceAgentType: 'codex',
+      registeredGroups: () => ({
+        'shared@g.us': {
+          name: 'Shared',
+          folder: 'shared-group',
+          trigger: '@Codex',
+          added_at: '2026-02-22T00:00:00.000Z',
+          agentType: 'codex',
+        },
+      }),
+      getSessions: () => ({}),
+      queue: { enqueueTask } as any,
+      onProcess: () => {},
+      sendMessage: async () => {},
+    });
+
+    await vi.advanceTimersByTimeAsync(10);
+
+    expect(enqueueTask).toHaveBeenCalledTimes(1);
+    expect(enqueueTask.mock.calls[0][0]).toBe('shared@g.us');
+    expect(enqueueTask.mock.calls[0][1]).toBe('task-group-context');
+  });
+
   it('renders watcher heartbeat messages with target and timing', () => {
     const prompt = `
 [BACKGROUND CI WATCH]