feat: 初始化高校人事请假考勤技能 (process-leave-attendance-default)

基于 skill-template 脚手架开发，包含：
- 5 张业务表（教职工、请假政策、考勤日历、请假记录、假期余额）
- 请假核算引擎（扣薪计算、审批层级判定、年假抵扣）
- CLI 入口（import-employees / calculate-leave / render-html）
- HTML 审批与扣薪报告生成
- 示例数据与完整测试套件（295 tests passed）

assets/examples/selection-label-column.action.example.json

@@ -0,0 +1,38 @@
+{
+  "id": "process-selected",
+  "label": "处理勾选",
+  "description": "对勾选行执行业务处理。示例：声明 labelColumn，让确认弹层「已选择」摘要显示可读名称。",
+  "placements": ["toolbar", "batch"],
+  "executionProfile": "async",
+  "interaction": "confirm",
+  "confirmation": {
+    "message": "将按技能业务规则处理勾选记录（具体是否跳过某些状态由 CLI 决定）。"
+  },
+  "bind": {
+    "tables": ["business_items"],
+    "inputMapping": {
+      "ids": "$selection.ids"
+    },
+    "labelColumn": "display_name"
+  },
+  "inputSchema": {
+    "type": "object",
+    "required": ["ids"],
+    "properties": {
+      "ids": {
+        "type": "string",
+        "title": "编号列表",
+        "description": "逗号分隔主键；宿主会预填勾选行",
+        "readOnly": true
+      }
+    }
+  },
+  "entrypoint": {
+    "type": "cli",
+    "command": "process",
+    "args": ["--ids", "{{ids}}"]
+  },
+  "hostEffects": {
+    "onSuccess": ["reloadTable"]
+  }
+}