chore(backlog): 记录 g122 完成

.ua/backlog.json

@@ -1339,7 +1339,7 @@
       "motivation": "评分只有整数档：商品 4.5 星、服务 3.5 分这类半档表达不了，调用方只能取整或自己换别的组件；点星也只能选整颗，左半区白白浪费",
       "acceptance": "RateProps 新增 allowHalf（缺省整数）：点击星标左半区记 0.5 分、右半区整颗，键盘步进同为 0.5（值按 0.5 量化夹取），悬停位置实时预览半格填充（左半亮右半灭走渐变裁字），value 信号可写入 x.5；文档参数表 / api 说明 / 手把手与 llms-full.txt 同步；npm run check 全绿",
       "notes": "自补：组件能力补齐；命中值与键盘步进共用 0.5 量化，不改信号语义",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -166,3 +166,4 @@
 {"ts":"2026-10-26T14:12:37+08:00","id":"g119","result":"done","commit":"176504b","summary":"empty 新增 icon：自定义插图进图标位，缺省 ⌀ 且保持 aria-hidden"}
 {"ts":"2026-10-26T14:13:19+08:00","id":"g120","result":"done","commit":"5a6c7a5","summary":"AGENTS.md 新增 10 行落点清单：新增/改参组件要动的文件与门禁原因"}
 {"ts":"2026-10-26T14:31:31+08:00","id":"g121","result":"done","commit":"151d901","summary":"textField 补 maxCount 字数统计（原生上限 + 附加组内 n/limit 实时计数）"}
+{"ts":"2026-10-26T14:34:12+08:00","id":"g122","result":"done","commit":"72c5d24","summary":"rate 支持 allowHalf 半星（左半区 0.5 分、键盘 0.5 步进、渐变裁字半格填充）"}