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>

conversation-display.mjs

@@ -0,0 +1,36 @@
+import { stripKnownChatSkillPrompt } from './chat-skills.mjs';
+
+/**
+ * Strip agent-only prefixes from persisted user messages for UI display.
+ * Regression guard — see docs/regression-guards/mindspace-publish-and-chat-finish.md
+ */
+
+export const TASK_ROUTING_HINT_RE = /^【TKMind 路由提示】[\s\S]*?\n\n/;
+export const MINDSPACE_CONTEXT_RE = /^\[MindSpace 上下文\][\s\S]*?\n\n/;
+const USER_IDENTITY_BLOCK_RE = /^\[用户身份\][\s\S]*?\n\n/;
+
+export function stripUserIdentityPrefix(text) {
+  return String(text ?? '').replace(USER_IDENTITY_BLOCK_RE, '').trimStart();
+}
+
+export function stripTaskRoutingHint(text) {
+  return String(text ?? '').replace(TASK_ROUTING_HINT_RE, '').trimStart();
+}
+
+export function stripMindSpaceContextPrefix(text) {
+  let next = String(text ?? '');
+  while (MINDSPACE_CONTEXT_RE.test(next)) {
+    next = next.replace(MINDSPACE_CONTEXT_RE, '').trimStart();
+  }
+  return next;
+}
+
+/** Strip agent-only prefixes from persisted user message content for UI display. */
+export function deriveUserFacingText(text) {
+  let next = String(text ?? '');
+  next = stripUserIdentityPrefix(next);
+  next = stripTaskRoutingHint(next);
+  next = stripMindSpaceContextPrefix(next);
+  next = stripKnownChatSkillPrompt(next);
+  return next.trim();
+}