docs: deposit selection summary and bind.labelColumn contract

assets/schemas/skill-actions.schema.json

@@ -301,9 +301,15 @@
             "pattern": "^[a-z][a-z0-9_]*$"
           },
           "description": "可选。将 inputSchema 属性名映射到业务表物理列名，供 Action 弹窗与 replaces create/update 抽屉复用列 displayName / lookup options。"
+        },
+        "labelColumn": {
+          "type": "string",
+          "minLength": 1,
+          "pattern": "^[a-z][a-z0-9_]*$",
+          "description": "可选。数据管理 Action 确认/表单弹层「已选择」摘要用的可读标签列（#id + 标签）。仅影响展示，不改变提交 payload。省略时宿主按常见列名启发（title/name 等），再不行只显示编号。"
         }
       },
-      "description": "表级绑定；toolbar 必填。可选 inputMapping / columnMapping。concurrency/locks 勿写入。"
+      "description": "表级绑定；toolbar 必填。可选 inputMapping / columnMapping / labelColumn。concurrency/locks 勿写入。"
     },
     "hostEffectId": {
       "type": "string",