fix(wechat): guard ambiguous memory recall and scheduled task execution

Skip memory injection for short filler messages, demote page-workflow memory
pollution, keep scheduled automation off page.generate, and fail scheduled
tasks that only return clarification instead of deliverables.

Co-authored-by: Cursor <cursoragent@cursor.com>

scheduled-task-worker.test.mjs

@@ -123,3 +123,55 @@ test('scheduled task worker marks failure after execution error', async () => {
 
   assert.deepEqual(calls, ['failed:3:agent timeout', 'notify:scheduled_task_failed']);
 });
+
+test('scheduled task worker marks failure when agent only asks for clarification', async () => {
+  const calls = [];
+  const task = {
+    id: 'task-3',
+    userId: 'user-3',
+    title: '每日诗意清晨',
+    recurrence: 'daily',
+    notifyChannel: 'web',
+    attempts: 1,
+  };
+  const worker = startScheduledTaskWorker({
+    intervalMs: 60_000,
+    userAuth: { id: 'user-auth' },
+    tkmindProxy: { id: 'proxy' },
+    scheduledTaskService: {
+      async listDueTasks() {
+        return [task];
+      },
+      async lockTask() {
+        return task;
+      },
+      async markTaskRunning(input) {
+        return input;
+      },
+      async markTaskSucceeded() {
+        calls.push('success');
+      },
+      async markTaskFailed(input, err) {
+        calls.push(`failed:${err.code}`);
+        return { ...input, status: 'failed', lastError: err.message };
+      },
+    },
+    scheduleService: {
+      async createUserNotification(input) {
+        calls.push(`notify:${input.notificationType}`);
+      },
+    },
+    executeTask: async () => ({
+      sessionId: 'session-3',
+      requestId: 'req-3',
+      deliveryText: '请问每天早上几点执行？',
+    }),
+    logger: { warn() {} },
+    runOnStart: false,
+  });
+
+  await worker.runOnce();
+  worker.stop();
+
+  assert.deepEqual(calls, ['failed:SCHEDULED_TASK_NON_DELIVERY', 'notify:scheduled_task_failed']);
+});