fix(mindspace): edit_file 落盘、Finish 聊天 merge 与回归守卫

- finish-sync 支持 edit_file 覆盖 public HTML
- Finish 同步 merge 本地流式消息，剥离 agent 内部前缀
- 新增 verify:mindspace-publish-guards 与 AGENTS.md 跨工具说明
- 发版脚本接入回归门禁；103 runtime 发布含备份回退

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

scripts/verify-public-finish-sync-runtime.mjs

@@ -65,8 +65,10 @@ const runtimeSource = fs.readFileSync(runtimeServer, 'utf8');
 const requiredRuntimeSnippets = [
   'normalizedName === "write"',
   'normalizedName.endsWith("__write")',
+  'normalizedName === "edit_file"',
+  'applyPublicHtmlEdit',
   'recentCount = 80',
-  'if (extractPublicHtmlWriteArtifacts([message]).length > 0) {',
+  'if (extractPublicHtmlWriteArtifacts([message], { publishDir }).length > 0) {',
 ];
 
 for (const snippet of requiredRuntimeSnippets) {