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/web-access/catalog-metadata.v1.json

@@ -0,0 +1,78 @@
+{
+  "$schema": "../../schemas/catalog-metadata.v1.schema.json",
+  "schemaVersion": 1,
+  "identity": {
+    "kind": "skill",
+    "id": "web-access"
+  },
+  "presentation": {
+    "defaultLocale": "en-US",
+    "i18n": {
+      "zh-CN": {
+        "name": "联网访问",
+        "summary": "联网搜索、网页抓取、内置受管浏览器登录态访问与取文、研究调研工作流",
+        "description": "联网访问工具包——搜索公开页面、Jina 优化抓取、内置受管浏览器完成登录态访问与取文，以及用户点名时接管他自己的 Chrome/Edge/Chromium。"
+      },
+      "en-US": {
+        "name": "Web Access",
+        "summary": "Web search, page fetching, logged-in access via the governed built-in browser, research workflows",
+        "description": "A web-access toolkit — search public pages, fetch heavy pages via Jina Reader, reach and read logged-in sites through the governed built-in browser, and drive the user's named Chrome/Edge/Chromium over CDP on request."
+      }
+    },
+    "category": "research",
+    "tags": [
+      "web",
+      "search",
+      "fetch",
+      "research",
+      "browsing",
+      "browser",
+      "cdp"
+    ]
+  },
+  "release": {
+    "state": "known",
+    "version": "3.4.4",
+    "versionScheme": "semver"
+  },
+  "timestamps": {
+    "catalogUpdatedAt": {
+      "state": "known",
+      "value": "2026-08-30T03:00:58Z",
+      "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"
+    },
+    "requiredClientVersion": "10.0.128"
+  },
+  "spec": {
+    "kind": "skill",
+    "riskLevel": "low",
+    "skillType": "procedural"
+  }
+}