fix(scheduled-task): deliver verified WeChat links only after page is ready

Wait for HTML materialization before releasing delivery contracts, pass
verified MindSpace URLs through proactive WeChat sends, resend on reconcile
when pages land late, and report deferred customer-service delivery as unsent.

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

notification-dispatcher.test.mjs

@@ -73,11 +73,30 @@ test('notification dispatcher forwards schedule notification text unchanged', as
         userId: 'user-2',
         dedupeKey: null,
         sent: true,
+        verifiedHtmlCount: 0,
       },
     },
   ]);
 });
 
+test('notification dispatcher returns false when wechat sender defers delivery', async () => {
+  const dispatcher = createNotificationDispatcher({
+    async sendWechatTextToUser() {
+      return { sent: false, deferred: true, errcode: 45015 };
+    },
+    logger: { info() {} },
+  });
+
+  assert.equal(
+    await dispatcher.sendScheduleNotification({
+      userId: 'user-4',
+      text: '定时任务完成',
+      verifiedHtmlUrls: ['https://m.tkmind.cn/MindSpace/user-4/public/news.html'],
+    }),
+    false,
+  );
+});
+
 test('notification dispatcher returns false when wechat sender is unavailable', async () => {
   const logs = [];
   const dispatcher = createNotificationDispatcher({
@@ -120,6 +139,7 @@ test('notification dispatcher returns false when wechat sender is unavailable',
         userId: 'user-3',
         dedupeKey: null,
         sent: false,
+        verifiedHtmlCount: 0,
       },
     },
   ]);