fix(wechat): repair share preview on disk for sanitized delivery artifacts

Production WeChat delivery strips localPath from artifacts, so share-preview
auto-repair never wrote back to HTML. Resolve paths via publishDir +
relativePath, repair at materialize and delivery prep, and pass h5Root from
Portal so page.generate can patch missing meta before sending links.

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

wechat-mp.mjs

@@ -61,6 +61,7 @@ import {
   collectWechatGeneratedImages,
 } from './wechat/verify/generated-thumbnail.mjs';
 import { resolveBillingTokenState } from './billing-token-state.mjs';
+import { resolveMindSpaceUserPublishDir } from './mindspace-runtime-config.mjs';
 import {
   buildPageDataCollectFailureText,
 } from './mindspace-page-data-finish-guard.mjs';
@@ -1503,6 +1504,7 @@ export function createWechatMpService({
   pageDataDeliveryReviewer = null,
   wechatFetch = undiciFetch,
   linkExists = defaultPublicHtmlLinkExists,
+  h5Root = '',
   logger = console,
 }) {
   const sessionStore = resolveSessionAccess({ userAuth, sessionAccess });
@@ -1513,6 +1515,11 @@ export function createWechatMpService({
   }
   const requireFreshPageThumbnail = config.requireFreshPageThumbnail === true;
   const repairFreshPageThumbnail = config.repairFreshPageThumbnail === true;
+  const resolveUserPublishDir = (userId) => {
+    const normalizedUserId = String(userId ?? '').trim();
+    if (!normalizedUserId || !String(h5Root ?? '').trim()) return '';
+    return resolveMindSpaceUserPublishDir(h5Root, { id: normalizedUserId });
+  };
   config = {
     ...loadWechatMpConfig({}),
     ...config,
@@ -2650,6 +2657,9 @@ export function createWechatMpService({
             htmlGenerationNeedsRetry,
             replyHasPublicLinks,
             topic: wechatIntent?.topic ?? intent?.agentText ?? '',
+            repairContext: {
+              publishDir: resolveUserPublishDir(user.userId),
+            },
           });
           if (pageOutcome.action === 'session_retry') {
             throw new Error('stale_session_poisoned_completion');
@@ -2969,6 +2979,9 @@ export function createWechatMpService({
             htmlGenerationNeedsRetry,
             replyHasPublicLinks,
             topic: wechatIntent?.topic ?? intent?.agentText ?? '',
+            repairContext: {
+              publishDir: resolveUserPublishDir(user.userId),
+            },
           });
           if (pageOutcome.action === 'session_retry' || pageOutcome.action === 'fail') {
             const text = pageOutcome.failureText ?? buildPagePublishFailureText();