fix: recover WeChat page thumbnail delivery

wechat-mp.test.mjs

@@ -864,11 +864,13 @@ test('loadWechatMpConfig requires full config and enable flag', () => {
   assert.equal(config.enabled, true);
   assert.equal(config.bindPath, '/auth/wechat/authorize?intent=login');
   assert.equal(config.requireFreshPageThumbnail, true);
+  assert.equal(config.repairFreshPageThumbnail, false);
   assert.deepEqual(config.generatedImagePublicBaseUrls, [
     'https://example.com',
     'https://img.example.com',
   ]);
   assert.equal(loadWechatMpConfig({ H5_WECHAT_MP_FRESH_PAGE_THUMBNAILS: '0' }).requireFreshPageThumbnail, false);
+  assert.equal(loadWechatMpConfig({ H5_WECHAT_MP_FRESH_THUMBNAIL_REPAIR: '1' }).repairFreshPageThumbnail, true);
 });
 
 test('verifyWechatMpSignature accepts valid signature', () => {
@@ -4949,7 +4951,7 @@ test('wechat mp service exposes route status and can recreate route for bound us
   assert.equal(calls.includes('upserted'), true);
 });
 
-test('wechat mp page delivery requires and verifies a current-run fresh thumbnail', async () => {
+test('wechat mp page delivery repairs one unambiguous fresh thumbnail missing from disk metadata', async () => {
   const token = 'token';
   const timestamp = '1710000000';
   const nonce = 'nonce';
@@ -4958,6 +4960,7 @@ test('wechat mp page delivery requires and verifies a current-run fresh thumbnai
   const wechatPayloads = [];
   const generated = {
     ok: true,
+    purpose: 'hero',
     jobId: 'job-fresh-page',
     source: { mimeType: 'image/webp', width: 1280, height: 720 },
     asset: {
@@ -4967,18 +4970,13 @@ test('wechat mp page delivery requires and verifies a current-run fresh thumbnai
       workspaceRelativePath: 'public/images/fresh-page.webp',
     },
   };
-  const pageHtml = previewReadyPageHtml({
-    title: 'Fresh',
-    subtitle: '本轮新缩略图',
-    cover: generated.asset.htmlSrc,
-  });
   const pageImage = await sharp({
     create: { width: 64, height: 64, channels: 3, background: '#3366cc' },
   }).webp().toBuffer();
   const eventFrame = (event) => `data: ${JSON.stringify(event)}\n\n`;
   const service = createBoundWechatService({
     token,
-    config: { requireFreshPageThumbnail: true },
+    config: { requireFreshPageThumbnail: true, repairFreshPageThumbnail: true },
     userAuth: {
       async resolveWorkingDir() {
         return workspaceRoot;
@@ -5031,16 +5029,6 @@ test('wechat mp page delivery requires and verifies a current-run fresh thumbnai
                       value: { content: [{ type: 'text', text: JSON.stringify(generated) }] },
                     },
                   },
-                  {
-                    id: 'call-write-page',
-                    type: 'toolRequest',
-                    toolCall: {
-                      value: {
-                        name: 'sandbox-fs__write_file',
-                        arguments: { path: 'public/fresh.html', content: pageHtml },
-                      },
-                    },
-                  },
                 ],
               },
             }),
@@ -5073,10 +5061,12 @@ test('wechat mp page delivery requires and verifies a current-run fresh thumbnai
         assert.equal(body.user_message.metadata.memindRun.inlineImageMode, 'auto');
         assert.match(body.user_message.content[0].text, /服务号页面新缩略图硬要求/);
         assert.match(body.user_message.content[0].text, /本轮新生成资产/);
+        assert.match(body.user_message.content[0].text, /禁止编造用户未提供的产品指标/);
+        assert.match(body.user_message.content[0].text, /Agent 层只调用一次 generate_image/);
         fs.mkdirSync(path.dirname(htmlPath), { recursive: true });
         fs.writeFileSync(
           htmlPath,
-          pageHtml,
+          previewReadyPageHtml({ title: 'Fresh', subtitle: '交付前磁盘副本' }),
           'utf8',
         );
         fs.mkdirSync(path.join(workspaceRoot, 'public', 'images'), { recursive: true });
@@ -5116,6 +5106,10 @@ test('wechat mp page delivery requires and verifies a current-run fresh thumbnai
     assert.equal(result.status, 200);
     await result.task;
     assert.equal(fs.existsSync(path.join(workspaceRoot, 'public', 'fresh.thumbnail.svg')), true);
+    assert.match(
+      fs.readFileSync(htmlPath, 'utf8'),
+      /"cover":"images\/fresh-page\.webp"/,
+    );
   } finally {
     crypto.randomUUID = originalRandomUuid;
     fs.rmSync(workspaceRoot, { recursive: true, force: true });