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

@@ -24,8 +24,8 @@
       "repo": "https://github.com/nextlevelbuilder/ui-ux-pro-max-skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "65e23199492fa911af32d9078e627ab4de01f4c8",
-      "syncedAt": "2026-06-27T16:00:00Z"
+      "commit": "8a81ed60272d21d4b8808f7308d49a0b1b000555",
+      "syncedAt": "2026-06-28T16:00:00Z"
     },
     {
       "id": "shadcn",
@@ -69,8 +69,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "13a25616e6354fe5abe16f41da18f532e51ac644",
-      "syncedAt": "2026-06-27T16:00:00Z"
+      "commit": "8e2b5b9a0312df3710568d8a0638d1b53356af2b",
+      "syncedAt": "2026-06-28T16:00:00Z"
     },
     {
       "id": "next-skills",
@@ -78,8 +78,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "4b164d765e16de0b277960a27d3938815ac03b97",
-      "syncedAt": "2026-06-27T16:00:00Z"
+      "commit": "f509282984a400b3316265c24e585873c97b8309",
+      "syncedAt": "2026-06-28T16:00:00Z"
     }
   ]
 }