feat: document optional replaces for CRUD mutation binding

assets/schemas/skill-actions.schema.json

@@ -28,6 +28,11 @@
       "enum": ["toolbar", "row", "batch", "cron", "agent", "skill-detail"],
       "description": "稳定支持 toolbar/row/batch/cron/agent/skill-detail（对齐匠厂宿主）。placements 与 executionProfile 正交，不做条件限制。"
     },
+    "mutationKind": {
+      "type": "string",
+      "enum": ["create", "update", "delete"],
+      "description": "可选。接管数据管理默认按钮：create=新增、update=编辑、delete=删除。须配合非空 bind.tables；无配置时宿主仍直写 SQLite。"
+    },
     "scalarArg": {
       "type": ["string", "number", "boolean"]
     },
@@ -144,10 +149,11 @@
         },
         "placements": {
           "type": "array",
-          "minItems": 1,
+          "minItems": 0,
           "items": { "$ref": "#/$defs/placement" },
-          "description": "决定 Action 出现在哪里；与 executionProfile 正交"
+          "description": "决定 Action 出现在哪里；与 executionProfile 正交。仅 replaces 接管默认 CRUD 时可为空数组。"
         },
+        "replaces": { "$ref": "#/$defs/mutationKind" },
         "entrypoint": { "$ref": "#/$defs/entrypoint" },
         "inputSchema": { "$ref": "#/$defs/inputSchema" },
         "confirmation": { "$ref": "#/$defs/confirmation" },
@@ -170,9 +176,12 @@
             "batch": { "type": "string", "enum": ["direct", "confirm", "form"] },
             "cron": { "type": "string", "enum": ["direct", "confirm", "form"] },
             "agent": { "type": "string", "enum": ["direct", "confirm", "form"] },
-            "skill-detail": { "type": "string", "enum": ["direct", "confirm", "form"] }
+            "skill-detail": { "type": "string", "enum": ["direct", "confirm", "form"] },
+            "create": { "type": "string", "enum": ["direct", "confirm", "form"] },
+            "update": { "type": "string", "enum": ["direct", "confirm", "form"] },
+            "delete": { "type": "string", "enum": ["direct", "confirm", "form"] }
           },
-          "description": "按 placement 覆盖 interaction（只能写 concrete 模式，不能写 auto）。常用于同一 Action 在 row 直通、toolbar 仍要表单。"
+          "description": "按 placement / replaces 覆盖 interaction（只能写 concrete 模式，不能写 auto）。"
         },
         "bind": { "$ref": "#/$defs/bind" }
       },
@@ -187,7 +196,17 @@
       "then": {
         "required": ["bind"]
       },
-      "description": "concurrency/locks 为未稳定预留字段，勿写入新技能 manifest。placements 含 toolbar 时必须声明 bind.tables。"
+      "allOf": [
+        {
+          "if": {
+            "required": ["replaces"]
+          },
+          "then": {
+            "required": ["bind"]
+          }
+        }
+      ],
+      "description": "concurrency/locks 为未稳定预留字段，勿写入新技能 manifest。placements 含 toolbar 或声明 replaces 时必须声明 bind.tables。无 replaces 时 placements 建议非空（模板测试强制）。"
     }
   }
 }