chore(backlog): 记录 g309 完成

.ua/backlog.json

@@ -3171,7 +3171,7 @@
     {
       "id": "g309",
       "domain": "tooling",
-      "status": "open",
+      "status": "done",
       "title": "把每轮迭代的手工留痕脚本收成 ua iter done / add",
       "motivation": "每轮收尾都要临时写 node 脚本改 backlog、手拼 iterations.log 的 JSON——历史踩过 ts 手写缺时区、字段顺序自创、状态忘记改、哈希抄错，lint-iterations 事后才拦。这条流程本该由 CLI 保证，不该每轮靠人记。",
       "acceptance": "① 新增 ua iter done <id> <commit> <summary> [notes]：backlog 置 done、追加 {ts,id,result,commit,summary} 固定字段行，ts 由本机时钟生成带 +08:00 偏移，commit 校验 7-40 位哈希，条目不存在直接报错；② ua iter add <json>：五字段齐全 + id 唯一校验后追加；③ usage 串、dispatch、CLI 清单三处同步（doctor 通过）；④ 临时脚本 .ua/log-one.mjs 与 .ua/add-entry.mjs 删除；⑤ npm run check 全绿。",

.ua/iterations.log

@@ -353,3 +353,4 @@
 {"ts":"2026-10-27T00:35:35+08:00","id":"g306","result":"done","commit":"0ce51eb","summary":"audit:surface 增两档淡底可见度校验，暗色弱档降到 2% 即拦下"}
 {"ts":"2026-10-27T00:36:37+08:00","id":"g307","result":"done","commit":"6dfc2f8","summary":"新增 --ua-z-raised 且拖拽行用上，投影不再被后续行遮住"}
 {"ts":"2026-10-27T00:37:46+08:00","id":"g308","result":"done","commit":"f1916ef","summary":"sortableList 贴边自动滚：拖到容器上下沿按帧滚动，松手即停"}
+{"ts":"2026-10-27T00:39:08+08:00","id":"g309","result":"done","commit":"ae105b6","summary":"新增 ua iter done/add：留痕与补条目由 CLI 保证字段、时区与状态，删掉两个临时脚本"}