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/lookup-action.example.json

@@ -0,0 +1,83 @@
+{
+  "_comment": "形状参考：Action 参数引用同库另一张表时用 Lookup。单选与多选同一 lookup 对象，多选只加 multiple:true。完整契约见 references/ACTIONS.md「跨表引用：Lookup」与 references/SCHEMA.md。",
+  "schemaVersion": 1,
+  "skill": "process-leave-attendance-default",
+  "actions": [
+    {
+      "id": "send-with-template",
+      "label": "按模板发送（示例）",
+      "description": "演示内联 lookup 单选：从 message_templates 选模板；-- 表示自动挑选。",
+      "placements": ["toolbar"],
+      "executionProfile": "async",
+      "interaction": "form",
+      "bind": {
+        "tables": ["leads"]
+      },
+      "entrypoint": {
+        "type": "cli",
+        "command": "engage",
+        "args": ["--template-id", "{{templateId}}", "--content", "{{content}}"]
+      },
+      "inputSchema": {
+        "type": "object",
+        "properties": {
+          "content": {
+            "type": "string",
+            "title": "正文",
+            "description": "填了就按这里发；留空则用下面的话术模板。",
+            "display_type": "textarea"
+          },
+          "templateId": {
+            "type": "number",
+            "title": "话术模板",
+            "description": "仅在正文留空时生效。选 -- = 自动挑选。",
+            "display_type": "lookup",
+            "lookup": {
+              "ref_table": "message_templates",
+              "value_column": "id",
+              "label_column": "name",
+              "extra_column": "channel",
+              "filter_column": "is_active",
+              "filter_value": 1
+            }
+          }
+        }
+      }
+    },
+    {
+      "id": "probe-with-engines",
+      "label": "按引擎抽检（多选示例）",
+      "description": "演示 lookup.multiple：从 engines 多选，提交为逗号分隔 id。",
+      "placements": ["toolbar"],
+      "executionProfile": "async",
+      "interaction": "form",
+      "bind": {
+        "tables": ["queries"]
+      },
+      "entrypoint": {
+        "type": "cli",
+        "command": "query",
+        "args": ["batch-probe", "--engine-ids", "{{engineIds}}"]
+      },
+      "inputSchema": {
+        "type": "object",
+        "properties": {
+          "engineIds": {
+            "type": "string",
+            "title": "将使用的引擎",
+            "description": "可多选；提交值为逗号分隔编号，如 1,2。",
+            "display_type": "lookup",
+            "lookup": {
+              "ref_table": "engines",
+              "value_column": "id",
+              "label_column": "display_name",
+              "filter_column": "enabled",
+              "filter_value": 1,
+              "multiple": true
+            }
+          }
+        }
+      }
+    }
+  ]
+}