chore(backlog): 记录 g09 完成

.ua/backlog.json

@@ -434,8 +434,8 @@
       "title": "新增 descriptions 描述列表组件",
       "motivation": "详情页与抽屉里高频需要 label:value 两列布局，目前只能借用 form 或手写 DOM；需要列数自适应与 bordered 两种形态",
       "acceptance": "新增 src/descriptions.ts：items(label/value/span) + column(1-4，窄屏自动降列) + bordered + size；label 走 text-muted 令牌，值支持任意 DOM；导出 + manifest + demo sec-descriptions + 文档同步；npm run check 全绿",
-      "status": "open",
-      "notes": "自补：组件补充方向"
+      "status": "done",
+      "notes": "API 为 items(label/value/span) + column(1-4) + bordered + size + title；列数通过 CSS 变量 --ua-desc-col 注入，样式表在 ≤640px 覆盖为单列；span 在 min(span, column) 处截断防越界；标题为可选外层 wrap；demo sec-descriptions 展示纯网格（含 tag 值与 span 占两列）与 bordered 小尺寸两种形态"
     },
     {
       "id": "g10",

.ua/iterations.log

@@ -53,3 +53,4 @@
 {"ts":"2026-10-23T19:08:37+08:00","id":"g06","result":"done","commit":"b6c9489","summary":"checkCountDocs 扫描列表加入 README.md，三份文档组件计数文本全部纳入漂移门禁"}
 {"ts":"2026-10-26T10:17:59+08:00","id":"g07","result":"done","commit":"db96a30","summary":"新增 timeline 时间线组件：语义色节点 + 左右轴线 + pending 进行中节点，demo/manifest/README/llms-full 同步"}
 {"ts":"2026-10-26T10:20:58+08:00","id":"g08","result":"done","commit":"0e385cd","summary":"新增 segmented 分段控制器：胶囊分段 + 滑动滑块 + 键盘导航，manifest/README/llms-full 同步"}
+{"ts":"2026-10-26T10:23:31+08:00","id":"g09","result":"done","commit":"d8d45fc","summary":"新增 descriptions 描述列表：label:value 网格 + 列数变量化 + 窄屏单列 + bordered 表格形态"}