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-executor.test.mjs

@@ -4,6 +4,7 @@ import {
   buildScheduledTaskExecutionPrompt,
   extractScheduledTaskDeliveryText,
   formatScheduledTaskDeliveryMessage,
+  looksLikeScheduledTaskNonDelivery,
 } from './scheduled-task-executor.mjs';
 
 test('buildScheduledTaskExecutionPrompt includes task spec and automation marker', () => {
@@ -19,6 +20,18 @@ test('buildScheduledTaskExecutionPrompt includes task spec and automation marker
   assert.match(text, /每日新闻页/);
   assert.match(text, /搜索今日新闻并生成 HTML 页面/);
   assert.match(text, /Scheduled Automation/);
+  assert.match(text, /禁止调用 scheduled_task_create/);
+});
+
+test('looksLikeScheduledTaskNonDelivery detects clarification replies', () => {
+  assert.equal(
+    looksLikeScheduledTaskNonDelivery('请问 7月31日具体几点执行这个任务？'),
+    true,
+  );
+  assert.equal(
+    looksLikeScheduledTaskNonDelivery('页面已生成：https://example.com/news.html'),
+    false,
+  );
 });
 
 test('extractScheduledTaskDeliveryText reads last assistant message', () => {