chore(backlog): 记录 g29 完成

.ua/backlog.json

@@ -594,8 +594,8 @@
       "title": "新增 carousel 轮播组件",
       "motivation": "组件库缺轮播，首页 banner/图片墙只能外部引库，样式与令牌体系脱节",
       "acceptance": "carousel({ items, index, autoplay, height, label, onChange }) 横排位移 + 指示点/箭头/←→ 键切换 + 悬停暂停 + 环形回绕；组件数 39→40 三处计数同步；npm run check 全绿",
-      "status": "open",
-      "notes": "自补：组件补充"
+      "status": "done",
+      "notes": "自补：组件补充；index 信号可外部受控，内部信号兜底"
     }
   ]
 }

.ua/iterations.log

@@ -73,3 +73,4 @@
 {"ts":"2026-10-26T11:36:38+08:00","id":"g26","result":"done","commit":"6ad0765","summary":"verify 新增令牌引用校验（拼错变量名即失败），ua tokens 与 llms-full 统一从 tokens.css 取令牌"}
 {"ts":"2026-10-26T11:37:50+08:00","id":"g27","result":"done","commit":"d80e132","summary":"新增 overlay.ts Esc 栈：modal/drawer 后开先关，栈空自动摘全局监听"}
 {"ts":"2026-10-26T11:38:48+08:00","id":"g28","result":"done","commit":"d9feeda","summary":"浮层 Esc 逐层关闭：menu/select/popover/tooltip/image 各自阻止冒泡，弹窗内的下拉收起不再连带关弹窗"}
+{"ts":"2026-10-26T11:40:10+08:00","id":"g29","result":"done","commit":"e5ed297","summary":"新增 carousel 轮播：横排位移 + 指示点/箭头/←→ 键 + autoplay 悬停暂停 + 环形回绕，组件数 39→40"}