feat(page-data): add validation suggestions, repair path, and thinking fixes

Map Page Data failure codes to Chinese remediation hints, trigger one-shot
goosed repair for remediable cases, and recover poisoned thinking sessions.
Route local DeepSeek through the no-think proxy via host.docker.internal so
tool rounds no longer hit reasoning_content 400; document gate and case-study
scenarios for event registration repair.

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

mindspace-page-data-finish-guard.mjs

@@ -19,6 +19,7 @@ import {
 import { listPageAccessPolicies } from './page-data-policy-store.mjs';
 import { buildPublicUrl, resolvePageDataDeliveryBaseUrl } from './user-publish.mjs';
 import { detectProhibitedBrowserStorage } from './mindspace-browser-storage-policy.mjs';
+import { buildPageDataValidationRepairPrompt } from './page-data-validation-suggestions.mjs';
 
 export { inferPageDataBindAccessMode };
 
@@ -436,31 +437,13 @@ export function buildPageDataCollectRepairPrompt({
   htmlIssues = [],
   unboundFiles = [],
 } = {}) {
-  const lines = [
-    '【系统交付门禁】本轮用户已要求使用专属 PostgreSQL 数据空间，但 Page Data 页面交付尚未验证完成。请立即按 page-data-collect 技能修复：',
-    '1. load_skill → page-data-collect',
-    '2. 确保 public/*.html 引入 /assets/page-data-client.js，且 JS 使用 MindSpacePageData.createClient({ apiBase: "/api" })',
-    '3. 禁止 /api/page-data/ 旁路、localStorage 或自建后端',
-    '4. 对每个 public/*.html 调用 private_data_bind_workspace_page（问卷页 public insert，后台页 password read，口令默认 88888888）',
-    '5. 向用户交付的链接必须使用 Portal（本地 http://127.0.0.1:8081），不要用 Vite 5173',
-  ];
-  if (htmlIssues.length) {
-    lines.push('', 'HTML 问题：');
-    for (const item of htmlIssues) {
-      lines.push(`- ${item.relativePath}: ${item.issue}`);
-    }
-  }
-  if (unboundFiles.length) {
-    lines.push('', '尚未 bind 的 Page Data 页面：');
-    for (const file of unboundFiles) {
-      const reasons = Array.isArray(file.bindReasons) && file.bindReasons.length
-        ? ` (${file.bindReasons.join(', ')})`
-        : '';
-      lines.push(`- ${file.relativePath}${reasons}`);
-    }
-  }
-  lines.push('', '修复完成前不要告诉用户“已发布/已可提交”。');
-  return lines.join('\n');
+  // Tier A suggestions are folded into the goosed repair turn so the agent
+  // receives actionable Chinese remediation, not only raw issue ids.
+  return buildPageDataValidationRepairPrompt({
+    htmlIssues,
+    unboundFiles,
+    message: '本轮用户已要求使用专属 PostgreSQL 数据空间，但 Page Data 页面交付尚未验证完成。',
+  });
 }
 
 export function shouldRetryPageDataCollectReply({