chore(backlog): 记录 g55 完成

.ua/backlog.json

@@ -796,6 +796,14 @@
       "acceptance": "新增 watermark(props, ...children)（canvas 平铺单元、令牌色解析、多行/旋转/间距可配、覆盖层 pointer-events:none）；manifest/docs/demo/README/计数同步；npm run check 全绿",
       "status": "done",
       "notes": "自补：组件补充；canvas 不认 CSS 变量，先 getComputedStyle 解析"
+    },
+    {
+      "id": "g55",
+      "title": "新增 checkboxGroup 多选组组件",
+      "motivation": "权限勾选、标签多选这类场景只有单个 checkbox，调用方要自己拼数组、自己算全选与半选、自己处理「最多选 N 项」",
+      "acceptance": "新增 checkboxGroup（数组信号、min/max 禁用边界、checkAll 半选、纵横向、整组禁用）；manifest/docs/demo/README/计数同步；npm run check 全绿",
+      "status": "done",
+      "notes": "自补：表单组件补缺；边界用禁用表达，不抛错不静默回滚"
     }
   ]
 }

.ua/iterations.log

@@ -99,3 +99,4 @@
 {"ts":"2026-10-26T12:16:11+08:00","id":"g52","result":"done","commit":"81ea189","summary":"新增 colorPicker：预设色板（缺省语义令牌色）+原生取色器+手输 CSS 颜色串，组件数 50→51"}
 {"ts":"2026-10-26T12:17:23+08:00","id":"g53","result":"done","commit":"697d354","summary":"新增 tour 引导漫游：聚光挖洞+卡片自动选方位+滚动重算+完成/跳过回调+Esc 入栈，组件数 51→52"}
 {"ts":"2026-10-26T12:18:24+08:00","id":"g54","result":"done","commit":"818e20e","summary":"新增 watermark：canvas 平铺单元+令牌色解析+多行旋转间距可配+覆盖层交互穿透，组件数 52→53"}
+{"ts":"2026-10-26T12:19:23+08:00","id":"g55","result":"done","commit":"e54fdb6","summary":"新增 checkboxGroup：数组信号+min/max 禁用边界+checkAll 半选+纵横向，组件数 53→54"}