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/minimax-video-gen/catalog-metadata.v1.json

@@ -0,0 +1,81 @@
+{
+  "$schema": "../../schemas/catalog-metadata.v1.schema.json",
+  "schemaVersion": 1,
+  "identity": {
+    "kind": "skill",
+    "id": "minimax-video-gen"
+  },
+  "presentation": {
+    "defaultLocale": "en-US",
+    "i18n": {
+      "zh-CN": {
+        "name": "MiniMax 文生视频",
+        "summary": "基于 MiniMax Hailuo 的文本/图片生成视频技能",
+        "description": "Use this skill when the user wants to generate videos using MiniMax's Hailuo model. Supports text-to-video, image-to-video, and subject reference. The API is asynchronous — submit a task, poll for status, then download. Use when 用户提到 生成视频、文生视频、AI 视频、创建视频、视频生成、 动画生成、MiniMax 视频、海螺、Hailuo、图片变视频、图生视频。"
+      },
+      "en-US": {
+        "name": "MiniMax Video Generation",
+        "summary": "Text/image-to-video skill powered by MiniMax Hailuo",
+        "description": "Use this skill when the user wants to generate videos using MiniMax's Hailuo model. Supports text-to-video, image-to-video, and subject reference. The API is asynchronous — submit a task, poll for status, then download. Use when the user mentions generating videos, text-to-video, AI video, creating videos, video generation, animation generation, MiniMax video, Hailuo, image-to-video."
+      }
+    },
+    "category": "media",
+    "tags": [
+      "media",
+      "video",
+      "generation",
+      "minimax",
+      "hailuo"
+    ]
+  },
+  "release": {
+    "state": "known",
+    "version": "1.3.1",
+    "versionScheme": "semver"
+  },
+  "timestamps": {
+    "catalogUpdatedAt": {
+      "state": "known",
+      "value": "2026-07-07T13:14:31Z",
+      "precision": "second"
+    },
+    "releasePublishedAt": {
+      "state": "unknown"
+    },
+    "reviewedAt": {
+      "state": "unknown"
+    },
+    "upstreamObservedAt": {
+      "state": "unknown"
+    }
+  },
+  "provenance": {},
+  "governance": {
+    "stewardship": "official",
+    "availability": "installable",
+    "license": {
+      "state": "unknown"
+    },
+    "redistribution": "verify-package-terms",
+    "listingMaintainer": {
+      "name": "DesireCore Official",
+      "verified": true
+    }
+  },
+  "compatibility": {
+    "platforms": {
+      "state": "unknown"
+    }
+  },
+  "spec": {
+    "kind": "skill",
+    "riskLevel": "low",
+    "skillType": "procedural",
+    "requires": {
+      "tools": [
+        "Bash"
+      ],
+      "connections": []
+    }
+  }
+}