fix(wechat): isolate page data sessions

wechat-mp.test.mjs

@@ -16,6 +16,7 @@ import {
   loadWechatMpConfig,
   maybeAttachPublishedHtmlLink,
   shouldRetryHtmlGenerationReply,
+  shouldForceNewWechatAgentSession,
   splitWechatText,
   verifyWechatMpSignature,
   verifyWechatMpUrlChallenge,
@@ -144,6 +145,15 @@ test('splitWechatText respects WeChat 2048-byte customer service limit', () => {
   assert.equal(chunks.join(''), longChinese);
 });
 
+test('Page Data requests always rotate away from an existing WeChat route', () => {
+  assert.equal(
+    shouldForceNewWechatAgentSession({ kind: 'chat.general' }, '做一个问卷，后台可以查看提交数据'),
+    true,
+  );
+  assert.equal(shouldForceNewWechatAgentSession({ kind: 'chat.general' }, '继续聊德川家康'), false);
+  assert.equal(shouldForceNewWechatAgentSession({ kind: 'session.reset' }, '继续聊德川家康'), true);
+});
+
 test('buildWechatAgentPrompt requires docx generation before html when Word download is requested', () => {
   const prompt = buildWechatAgentPrompt({
     msgType: 'text',