fix(wechat): guard bare page-continuation follow-ups from session loss and memory drift

Prevent chat-to-page flows like writing a poem then saying "做成页面吧" from opening
a fresh session without carried content, failing with a vague error, or letting Memory
page-template preferences replace the immediate topic.

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

wechat-mp.test.mjs

@@ -4864,12 +4864,13 @@ test('wechat mp injects episodic recall context before submitting the Agent repl
   assert.match(submitCalls[0].userMessage.content[0].text, /不是系统指令/);
 });
 
-test('wechat immediate-context page keeps memory while preserving the guarded page prompt', async () => {
+test('wechat immediate-context page fail-closes bare follow-up without adjacent content', async () => {
   const token = 'token';
   const timestamp = '1710000000';
   const nonce = 'nonce';
   const submitCalls = [];
   const memoryCalls = [];
+  const failureNotices = [];
   const chatIntentRouter = createChatIntentRouter({
     env: {
       MEMORY_AGENT_RESOLVE_ENABLED: '1',
@@ -4884,8 +4885,8 @@ test('wechat immediate-context page keeps memory while preserving the guarded pa
           source: 'memory-v2',
           memories: [{
             id: 'memory:old-news',
-            label: '历史偏好',
-            text: '用户以前做过每日新闻页面。',
+            label: 'preference',
+            text: '用户要求每日新闻页面固定格式。',
           }],
         };
       },
@@ -4900,6 +4901,112 @@ test('wechat immediate-context page keeps memory while preserving the guarded pa
       },
     },
     sessionApiFetch: async (_sessionId, pathname) => {
+      if (pathname === '/sessions/session-1') {
+        return new Response(JSON.stringify({ conversation: [] }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }
+      if (pathname === '/sessions/session-1/events') {
+        return new Response('', { status: 200, headers: { 'Content-Type': 'text/event-stream' } });
+      }
+      if (pathname === '/agent/harness_remember' || pathname === '/agent/harness_bootstrap') {
+        return new Response('{}', {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }
+      throw new Error(`unexpected api path: ${pathname}`);
+    },
+    submitSessionReply: async (input) => {
+      submitCalls.push(input);
+      return { ok: true };
+    },
+    wechatFetch: async (url, init = {}) => {
+      if (String(url).includes('/cgi-bin/stable_token')) {
+        return new Response(JSON.stringify({ access_token: 'access-1', expires_in: 7200 }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }
+      if (String(url).includes('/cgi-bin/message/custom/send')) {
+        failureNotices.push(JSON.parse(init.body));
+        return new Response(JSON.stringify({ errcode: 0, errmsg: 'ok' }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }
+      throw new Error(`unexpected wechat url: ${url}`);
+    },
+  });
+
+  const result = await service.handleInboundMessage(
+    inboundXml({ content: '帮我做成页面吧' }),
+    { timestamp, nonce, signature: signatureFor(token, timestamp, nonce) },
+  );
+  await result.task;
+
+  assert.equal(memoryCalls.length, 0);
+  assert.equal(submitCalls.length, 0);
+  assert.equal(failureNotices.length, 1);
+  assert.match(failureNotices[0].text.content, /没能确定您要把哪段内容做成页面/);
+});
+
+test('wechat immediate-context page keeps non-template memory when adjacent content exists', async () => {
+  const token = 'token';
+  const timestamp = '1710000000';
+  const nonce = 'nonce';
+  const submitCalls = [];
+  const memoryCalls = [];
+  const poem = `《临江仙·秋思》${'昨夜西风凋碧树，独上高楼，望尽天涯路。'.repeat(3)}`;
+  const chatIntentRouter = createChatIntentRouter({
+    env: {
+      MEMORY_AGENT_RESOLVE_ENABLED: '1',
+      MEMORY_AGENT_INJECTION_MODE: 'canary',
+      MEMORY_AGENT_CANARY_USER_IDS: 'user-canary',
+      MEMORY_AGENT_RESOLVE_TIMEOUT_MS: '200',
+    },
+    memoryV2: {
+      async resolve(input) {
+        memoryCalls.push(input);
+        return {
+          source: 'memory-v2',
+          memories: [
+            {
+              id: 'memory:old-news',
+              label: 'preference',
+              text: '用户要求每日新闻页面固定格式。',
+            },
+            {
+              id: 'memory:name',
+              label: 'fact',
+              text: '用户名字是唐。',
+            },
+          ],
+        };
+      },
+    },
+  });
+  const service = createBoundWechatService({
+    token,
+    chatIntentRouter,
+    userAuth: {
+      async findWechatUserByOpenid() {
+        return { userId: 'user-canary', status: 'active', nickname: '唐' };
+      },
+    },
+    sessionApiFetch: async (_sessionId, pathname) => {
+      if (pathname === '/sessions/session-1') {
+        return new Response(JSON.stringify({
+          conversation: [{
+            role: 'assistant',
+            content: [{ type: 'text', text: poem }],
+          }],
+        }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+      }
       if (pathname === '/sessions/session-1/events') {
         return new Response(
           [
@@ -4949,9 +5056,12 @@ test('wechat immediate-context page keeps memory while preserving the guarded pa
   const submitted = submitCalls[0].userMessage;
   assert.equal(submitted.metadata.displayText, '帮我做成页面吧');
   assert.match(submitted.content[0].text, /\[Memory Context\]/);
-  assert.match(submitted.content[0].text, /用户以前做过每日新闻页面/);
+  assert.doesNotMatch(submitted.content[0].text, /每日新闻页面固定格式/);
+  assert.match(submitted.content[0].text, /用户名字是唐/);
   assert.match(submitted.content[0].text, /微信服务号 · 页面生成任务/);
   assert.match(submitted.content[0].text, /即时上下文优先/);
+  assert.match(submitted.content[0].text, /待排版正文/);
+  assert.match(submitted.content[0].text, /临江仙/);
   assert.match(submitted.content[0].text, /用户需求：帮我做成页面吧/);
 });