chore(backlog): 记录 f05 完成

.ua/backlog.json

@@ -354,7 +354,7 @@
       "title": "ua index 幂等化：generatedAt 仅内容变化时更新",
       "motivation": "ua index 每次重写 .ua/index.json 的 generatedAt，npm run check 必然弄脏工作区，与「提交前 check」工作流冲突",
       "acceptance": "index 命令改为：若除 generatedAt 外内容与现有文件一致则不写入（或 generatedAt 改为内容哈希派生）；连续两次 npm run check 后 git status 必须干净",
-      "status": "open",
+      "status": "done",
       "notes": "来源：审计应修 #5"
     },
     {

.ua/iterations.log

@@ -43,3 +43,4 @@
 {"ts":"2026-10-23T18:44:08+08:00","id":"f02","result":"done","commit":"f2fc286","summary":"AGENTS.md 与 ITERATION.md 的 npm run check 描述补上 verify，与实际六步链一致"}
 {"ts":"2026-10-23T18:46:55+08:00","id":"f03","result":"done","commit":"f57da4c","summary":"ua 新增 lint-iterations 子命令校验留痕格式并并入 check 链，36 条历史违规行按 git author date 回填修复"}
 {"ts":"2026-10-23T18:48:36+08:00","id":"f04","result":"done","commit":"99ce0cd","summary":"commit-lint 收严：非 iter type 必须带 scope，裸 chore:/docs:/iter: 反向用例全部拒绝，COMMITTING.md 同步"}
+{"ts":"2026-10-23T18:52:12+08:00","id":"f05","result":"done","commit":"265060f","summary":"ua index 幂等化：剔除 generatedAt 比对且行尾归一化，内容无变化跳写，连续两次 check 后工作区干净"}