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.

plugins/codex/plugins/shadcn/THIRD_PARTY_SOURCE.json

@@ -2,8 +2,8 @@
   "sourceId": "shadcn",
   "repo": "https://github.com/shadcn-ui/ui.git",
   "ref": "main",
-  "commit": "c2477f311c19982ef6e246085438e6cfec3e35ea",
+  "commit": "d2fba50ee5b9113008b5bb908563527b7efd2f27",
   "adapter": "claude-skill",
   "sourcePath": "skills/shadcn",
-  "syncedAt": "2026-10-15T16:00:00Z"
+  "syncedAt": "2026-10-17T16:00:00Z"
 }