chore(backlog): 记录 g71 完成

.ua/backlog.json

@@ -924,6 +924,14 @@
       "acceptance": "smoke 新增三条不变量：multi 双列规则生成且按规则序生效（city 升序 + 同城 age 升序）、setPageSize 回第 1 页、reset 清空排序筛选并把分页回 1/20；npm run check 全绿",
       "status": "done",
       "notes": "自补：回归网；断言数 9 → 16"
+    },
+    {
+      "id": "g71",
+      "title": "数据表表头补 aria-sort 三态播报",
+      "motivation": "排序态只有 ↑ / ↓ / ↕ 视觉箭头，读屏用户听不出当前按哪列排、什么方向；这是可排序表最基本的一条 a11y 约束",
+      "acceptance": "可排序 th 用 effect 同步 aria-sort（ascending / descending / none），与箭头同源；文档手把手补一条；npm run check 全绿",
+      "status": "done",
+      "notes": "自补：无障碍；非 sortable 列不写 aria-sort，避免读屏误报"
     }
   ]
 }

.ua/iterations.log

@@ -115,3 +115,4 @@
 {"ts":"2026-10-26T12:37:22+08:00","id":"g68","result":"done","commit":"99981fe","summary":"alert 增加 showIcon/icon 语义图标（aria-hidden 纯装饰）与 banner 通栏形态，补齐文档与演示"}
 {"ts":"2026-10-26T12:38:50+08:00","id":"g69","result":"done","commit":"e6cf875","summary":"修正 toggleSort 非 multi 永远停在 asc 的循环 bug 与 getPageInfo 陈旧快照，冒烟补三条不变量"}
 {"ts":"2026-10-26T12:39:32+08:00","id":"g70","result":"done","commit":"5fb61e1","summary":"冒烟补多列排序优先级、setPageSize 回首页、reset 回默认态三条不变量，断言 9 → 16"}
+{"ts":"2026-10-26T12:40:29+08:00","id":"g71","result":"done","commit":"a6d0692","summary":"数据表可排序表头补 aria-sort 三态（ascending/descending/none），与视觉箭头同源"}