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/skill-cell-presentation.example.json

@@ -0,0 +1,29 @@
+{
+  "schemaVersion": 1,
+  "skill": "process-leave-attendance-default",
+  "table": "business_records",
+  "rowKey": "id",
+  "generatedAt": "2026-08-10T06:00:00Z",
+  "cells": [
+    {
+      "rowId": "42",
+      "column": "qty",
+      "tone": "danger",
+      "message": "库存低于安全线",
+      "alert": true
+    },
+    {
+      "rowId": "42",
+      "column": "status",
+      "tone": "warning",
+      "message": "待审核"
+    },
+    {
+      "rowId": "99",
+      "column": "print_done_at",
+      "tone": "danger",
+      "message": "环节到期未填",
+      "alert": true
+    }
+  ]
+}