chore(backlog): 记录 g144 完成

.ua/backlog.json

@@ -1515,7 +1515,7 @@
       "motivation": "协作列表 / 评论头部要展示参与人，并排 avatar 占横向空间且没有「还有 N 人」的表达；调用方各自用 margin 叠放，切口与层级都不一致",
       "acceptance": "avatarGroup 支持 items（name/src/variant）、max 折叠为 +N、size 与 avatar 对齐；整组 title 列全部姓名、+N 有可访问名；样式只消费 --ua-*；文档与演示同步；npm run check 全绿",
       "notes": "自补：组件补充方向",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -188,3 +188,4 @@
 {"ts":"2026-10-26T15:36:29+08:00","id":"g141","result":"done","commit":"6cde618","summary":"notification 新增 placement 四角停靠：每角独立容器与 3 条上限，顶部角落 column-reverse 让新通知贴边出现"}
 {"ts":"2026-10-26T15:37:34+08:00","id":"g142","result":"done","commit":"5af2139","summary":"space 新增 split：只在 2 个以上子元素间插分隔符，aria-hidden + 弱化色 + 不可选中"}
 {"ts":"2026-10-26T15:38:51+08:00","id":"g143","result":"done","commit":"3058da1","summary":"tabs 新增 extra 右侧操作区：与页签同一行共用分隔线，不传时 DOM 结构不变"}
+{"ts":"2026-10-26T15:40:02+08:00","id":"g144","result":"done","commit":"1009c89","summary":"新增 avatarGroup（叠放 + max 折叠 +N，整组 title 列全部姓名，+N 补可访问名），组件 66→67"}