feat: 迁移统一目录元数据契约 (#102)

## 中文

- 为 System Agent、34 个 Builtin Skill、28 个 Pointer/Collection 条目增加 catalog
sidecar
- 覆盖 147 个 collection child，并固定可证明的来源；无法证明的内容保持 listing-only/unknown
- 增加 strict Schema、validator、collection check 与 CI 完整性门禁

## English

- Add catalog metadata sidecars for the System Agent, 34 built-in
Skills, and 28 pointer/collection entries
- Cover 147 collection children while keeping unverifiable facts
listing-only or unknown
- Add strict schemas, validators, deterministic collection checks, and
CI completeness gates

## 验证 / Verification

- Catalog validator 17/17
- Collection generator 4/4
- 63 sidecars, 147 children, zero errors

skills/netease-skills/catalog-metadata.v1.json

@@ -0,0 +1,155 @@
+{
+  "$schema": "../../schemas/catalog-metadata.v1.schema.json",
+  "schemaVersion": 1,
+  "identity": {
+    "kind": "skill",
+    "id": "netease-skills"
+  },
+  "presentation": {
+    "defaultLocale": "en-US",
+    "i18n": {
+      "en-US": {
+        "name": "NetEase Skills",
+        "summary": "NetEase Cloud Music agent skills built on ncm-cli, for music search, playback and account setup"
+      },
+      "zh-CN": {
+        "name": "网易云音乐 Skills",
+        "summary": "基于 ncm-cli 的网易云音乐 AI Agent 技能包，支持音乐搜索、播放与账号配置等操作"
+      }
+    },
+    "category": "productivity",
+    "tags": [
+      "NetEase"
+    ]
+  },
+  "release": {
+    "state": "unknown"
+  },
+  "timestamps": {
+    "catalogUpdatedAt": {
+      "state": "known",
+      "value": "2026-08-30T18:00:09Z",
+      "precision": "second"
+    },
+    "releasePublishedAt": {
+      "state": "unknown"
+    },
+    "reviewedAt": {
+      "state": "unknown"
+    },
+    "upstreamObservedAt": {
+      "state": "known",
+      "value": "2026-08-30T18:00:09Z",
+      "precision": "second"
+    }
+  },
+  "provenance": {
+    "content": {
+      "kind": "git",
+      "url": "https://github.com/NetEase/skills.git",
+      "ref": "58ff0771d6977feb847d6bfe322280eec4bec004"
+    }
+  },
+  "governance": {
+    "stewardship": "pointer",
+    "availability": "listing-only",
+    "license": {
+      "state": "unknown"
+    },
+    "redistribution": "source-pointer-only",
+    "upstreamMaintainer": {
+      "name": "NetEase",
+      "url": "https://github.com/NetEase/skills",
+      "verified": false
+    }
+  },
+  "compatibility": {
+    "platforms": {
+      "state": "unknown"
+    }
+  },
+  "spec": {
+    "kind": "skill",
+    "collection": {
+      "role": "parent",
+      "childCount": 3,
+      "children": [
+        {
+          "identity": {
+            "kind": "skill",
+            "id": "ncm-cli-setup",
+            "parentId": "netease-skills"
+          },
+          "path": "ncm-cli-setup",
+          "presentation": {
+            "defaultLocale": "en-US",
+            "i18n": {
+              "en-US": {
+                "name": "ncm-cli-setup",
+                "summary": "安装和配置 ncm-cli（网易云音乐 CLI 工具）。当用户需要安装 ncm-cli、配置 API Key、安装 mpv 播放器，或排查安装问题时，使用此 skill。"
+              },
+              "zh-CN": {
+                "name": "ncm-cli-setup",
+                "summary": "安装和配置 ncm-cli（网易云音乐 CLI 工具）。当用户需要安装 ncm-cli、配置 API Key、安装 mpv 播放器，或排查安装问题时，使用此 skill。"
+              }
+            },
+            "tags": []
+          },
+          "release": {
+            "state": "unknown"
+          }
+        },
+        {
+          "identity": {
+            "kind": "skill",
+            "id": "netease-music-assistant",
+            "parentId": "netease-skills"
+          },
+          "path": "netease-music-assistant",
+          "presentation": {
+            "defaultLocale": "en-US",
+            "i18n": {
+              "en-US": {
+                "name": "netease-music-assistant",
+                "summary": "网易云音乐智能助手，以模型判断为核心，通过 ncm-cli 执行操作。"
+              },
+              "zh-CN": {
+                "name": "netease-music-assistant",
+                "summary": "网易云音乐智能助手，以模型判断为核心，通过 ncm-cli 执行操作。"
+              }
+            },
+            "tags": []
+          },
+          "release": {
+            "state": "unknown"
+          }
+        },
+        {
+          "identity": {
+            "kind": "skill",
+            "id": "netease-music-cli",
+            "parentId": "netease-skills"
+          },
+          "path": "netease-music-cli",
+          "presentation": {
+            "defaultLocale": "en-US",
+            "i18n": {
+              "en-US": {
+                "name": "netease-music-cli",
+                "summary": "使用 ncm-cli 操作网易云音乐。当用户想播放歌曲、搜索歌曲、控制播放（暂停、下一首、上一首、调音量）、管理播放队列、查看播放状态、播放歌单时，使用此 skill。"
+              },
+              "zh-CN": {
+                "name": "netease-music-cli",
+                "summary": "使用 ncm-cli 操作网易云音乐。当用户想播放歌曲、搜索歌曲、控制播放（暂停、下一首、上一首、调音量）、管理播放队列、查看播放状态、播放歌单时，使用此 skill。"
+              }
+            },
+            "tags": []
+          },
+          "release": {
+            "state": "unknown"
+          }
+        }
+      ]
+    }
+  }
+}

skills/netease-skills/entry.json

@@ -28,7 +28,8 @@
   "source": {
     "kind": "git",
     "repoUrl": "https://github.com/NetEase/skills.git",
-    "repoBranch": "master"
+    "repoBranch": "master",
+    "ref": "58ff0771d6977feb847d6bfe322280eec4bec004"
   },
   "children": [
     {