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/caveman/THIRD_PARTY_SOURCE.json

@@ -2,8 +2,8 @@
   "sourceId": "caveman",
   "repo": "https://github.com/JuliusBrussee/caveman.git",
   "ref": "main",
-  "commit": "df2ccd85c94ec3c8289cb62ac020d241ccfb0c60",
+  "commit": "b4de606fb871b0d9d454495f3d636b744d560875",
   "adapter": "codex-plugin",
   "sourcePath": "plugins/caveman",
-  "syncedAt": "2026-08-30T16:00:00Z"
+  "syncedAt": "2026-09-02T10:37:18Z"
 }