fix(wechat): retry missing page thumbnails in fresh sessions

wechat-mp.mjs

@@ -1030,6 +1030,7 @@ export function isRecoverableWechatAgentSessionError(message) {
   const normalized = String(message ?? '').trim();
   if (!normalized) return false;
   if (/stale_session_poisoned_completion/i.test(normalized)) return true;
+  if (/wechat_page_fresh_thumbnail_required:/i.test(normalized)) return true;
   if (/403|404|not found|无权访问/i.test(normalized)) return true;
   if (/tool_calls|tool_call_id|insufficient tool messages/i.test(normalized)) return true;
   if (/session already has an active request|active request.*cancel/i.test(normalized)) return true;
@@ -1840,6 +1841,7 @@ export function createWechatMpService({
     user,
     imagePolicy,
     publishDir,
+    notifyFailure = true,
   }) => {
     if (imagePolicy?.pageThumbnailMode !== WECHAT_PAGE_THUMBNAIL_MODE.REQUIRED_FRESH) return;
     const images = collectWechatGeneratedImages(reply?.messages ?? []);
@@ -1860,14 +1862,16 @@ export function createWechatMpService({
       }
     }
     const text = buildPagePublishFailureText({ missingFreshThumbnail: true });
-    try {
-      await sendCustomerServiceText(openid, text, user);
-    } catch (sendErr) {
-      logger.error?.('WeChat MP fresh thumbnail failure notice failed:', sendErr);
+    if (notifyFailure) {
+      try {
+        await sendCustomerServiceText(openid, text, user);
+      } catch (sendErr) {
+        logger.error?.('WeChat MP fresh thumbnail failure notice failed:', sendErr);
+      }
     }
     const error = new Error(`wechat_page_fresh_thumbnail_required:${verification.reason}`);
     error.code = 'WECHAT_PAGE_FRESH_THUMBNAIL_REQUIRED';
-    throw markWechatUserNotified(error);
+    throw notifyFailure ? markWechatUserNotified(error) : error;
   };
 
   const ensureSessionProvider = async (sessionId) => {
@@ -2351,6 +2355,7 @@ export function createWechatMpService({
           user,
           imagePolicy,
           publishDir: workingDir,
+          notifyFailure: false,
         });
       }
       const pageDataOutcome = await enforcePageDataCollectDelivery({