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/release-portal-runtime-prod.sh

@@ -121,7 +121,7 @@ if [[ "${SKIP_TESTS}" -ne 1 ]]; then
   (
     cd "${ROOT}"
     npm test -- --test-name-pattern='publish|space|billing' >/dev/null
-    node --test mindspace-public-finish-sync.test.mjs >/dev/null
+    npm run verify:mindspace-publish-guards >/dev/null
   )
 fi
 
@@ -154,10 +154,10 @@ verify_runtime_artifact() {
 
 verify_runtime_artifact
 
-say "验证公开 HTML 完成同步守卫"
+say "验证 MindSpace 发布与聊天 Finish 回归守卫"
 (
   cd "${ROOT}"
-  npm run verify:public-finish-sync-runtime
+  npm run verify:mindspace-publish-guards:full
 )
 
 verify_remote_goosed_dependency() {