fix(wechat): deliver failure notices and hot-swappable wechat-mp bundle

Notify users when HTML publish guards reject stub pages instead of silently
failing, send real page links when non-stub files exist, and split wechat-mp
into wechat-mp.bundle.mjs for fast production updates without full portal rebuilds.

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

scripts/build-portal-runtime.mjs

@@ -369,6 +369,7 @@ async function writeMetadata() {
       '',
       'Bundled alongside server.mjs (required for sandbox-fs MCP):',
       '  mindspace-sandbox-mcp.mjs  (esbuild bundle; includes schedule-service deps)',
+      '  wechat-mp.bundle.mjs         (esbuild bundle; hot-swappable WeChat MP module)',
       '',
       'Post-deploy validation (scripts/check-mindspace-public-links.mjs):',
       '  Scans MindSpace/*/public/*.html for missing relative href/src/cover targets.',
@@ -423,10 +424,16 @@ async function writeMetadata() {
   );
 }
 
+async function bundleWechatMp() {
+  console.log('==> 打包 WeChat MP runtime bundle');
+  await run('node', ['scripts/build-wechat-mp-runtime.mjs']);
+}
+
 async function main() {
   await buildFrontend();
   await copyRuntimeAssets();
   await bundleServer();
+  await bundleWechatMp();
   await bundleSandboxMcp();
   await bundleAgentRunWorker();
   if (runtimeInstallMode === 'bundle-node-modules' && !skipNodeModules) {