Sync third-party and MCP marketplace plugins

Constraint: Public skills are published only by explicit administrator action unless they are tracked third-party market sources.
Confidence: high
Scope-risk: narrow
Directive: Keep private/internal skills out of the public marketplace and preserve normal incremental market Git history.
Tested: Marketplace validation passed.

config/external-sources.lock.json

@@ -33,8 +33,8 @@
       "repo": "https://github.com/nextlevelbuilder/ui-ux-pro-max-skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "e353a508767c6d39f0e7698b084dbfc8699fffd3",
-      "syncedAt": "2026-08-25T16:00:00Z"
+      "commit": "e4f45473691e4b389519ee4bc359a3d6df666c26",
+      "syncedAt": "2026-08-26T16:00:00Z"
     },
     {
       "id": "caveman",
@@ -60,8 +60,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "ee628d75dea87325735fafa7c54f5d7d7edb8774",
-      "syncedAt": "2026-08-25T16:00:00Z"
+      "commit": "683a5a9b370acdb7785a0529434e6a3b8c7e0441",
+      "syncedAt": "2026-08-26T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -114,8 +114,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "d79b0d09cbed2a6d6a5f28680ab621e651326c30",
-      "syncedAt": "2026-08-25T16:00:00Z"
+      "commit": "94327e8ade8dedd70a0d007d6a49ace64b75ed70",
+      "syncedAt": "2026-08-26T16:00:00Z"
     }
   ]
 }