chore(backlog): 记录 g104 完成

.ua/backlog.json

@@ -1195,7 +1195,7 @@
       "motivation": "iterations.log 目前只校验字段格式：commit 随便写个哈希、或复制粘贴时抄错一位，门禁照样全绿。留痕是「这条迭代真的落过」的唯一凭证，凭证本身不可验证等于没校验",
       "acceptance": "ua lint-iterations 额外做双向核对：每行 commit 必须能在 git 历史里按前缀命中，且该提交主题以 iter(<id>) 开头（兼容早期无 scope 的 iter: <id>）；伪造 / 抄错的哈希报违规并退出码 1；非 git 环境（打包分发）自动跳过该维度；ITERATION.md 留痕章节写明该校验；npm run check 全绿",
       "notes": "自补：门禁工具链；一次 git log 建索引，150 行留痕不额外起进程",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -148,3 +148,4 @@
 {"ts":"2026-10-26T13:50:16+08:00","id":"g101","result":"done","commit":"265842e","summary":"新增 anchor 锚点导航：滚动高亮 + aria-current、offset 偏移定位、replaceState 写 hash，组件 57→58"}
 {"ts":"2026-10-26T13:51:46+08:00","id":"g102","result":"done","commit":"abfbb82","summary":"trapFocus 下沉到 overlay，modal/drawer 改调用，image 预览层补焦点锁与初始聚焦"}
 {"ts":"2026-10-26T13:54:09+08:00","id":"g103","result":"done","commit":"e497c16","summary":"dataTable 空状态分「暂无数据 / 没有符合关键词的行 + 一键清除筛选」，空状态行抽 tableEmpty.ts"}
+{"ts":"2026-10-26T13:55:22+08:00","id":"g104","result":"done","commit":"8e2175d","summary":"lint-iterations 回查留痕提交：哈希须真实存在且主题指向同一条目"}