fix(web): keep block ids and drafts across editor hydration races

Background GET rebuilt markdown AST with Math.random ids and dropped
head_block_map, so save closed the modal without PATCH. Align hydrate
to the ledger map, gate in-flight responses, and fail-closed on stale ids.

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

.doc/audit/INDEX.md

@@ -31,6 +31,14 @@
 
 ### 最新专项审计（2026-09-13）
 
+**文件**: [2026-09-13-document-revision-editor-hydration-race.md](./2026-09-13-document-revision-editor-hydration-race.md)
+
+**结论**: 第十二轮 UI-06 在 fill 窗口完成后台 hydration，块 ID 被重建；保存按旧 ID 找不到目标后静默关窗，未发 PATCH，修订停在 r0。
+
+**整改**: [编辑弹窗 hydration 竞态整改](../remediation/2026-09-13-document-revision-editor-hydration-race.md)
+
+### 对话意图运行时审计（2026-09-13）
+
 **文件**: [2026-09-13-conversation-intent-runtime-state.md](./2026-09-13-conversation-intent-runtime-state.md)
 
 **结论**: 真实会话被诊断探针污染；客户端名词匹配令只读总结请求误启动写任务；错误动作与文档租约状态刷新后无法恢复。