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

@@ -27,6 +27,15 @@
       "commit": "4baa399d00da806f83ed93652172f66943205153",
       "syncedAt": "2026-07-05T16:00:01Z"
     },
+    {
+      "id": "caveman",
+      "pluginName": "caveman",
+      "repo": "https://github.com/JuliusBrussee/caveman.git",
+      "ref": "main",
+      "adapter": "codex-plugin",
+      "commit": "0d95a81d35a9f2d123a5e9430d1cfc43d55f1bb0",
+      "syncedAt": "2026-07-06T02:08:42Z"
+    },
     {
       "id": "shadcn",
       "pluginName": "shadcn",
@@ -80,15 +89,6 @@
       "adapter": "skill-collection",
       "commit": "00598045032a0e5b313de7b6ef0af60ed9390c2a",
       "syncedAt": "2026-07-05T16:00:01Z"
-    },
-    {
-      "id": "caveman",
-      "pluginName": "caveman",
-      "repo": "https://github.com/JuliusBrussee/caveman.git",
-      "ref": "main",
-      "adapter": "codex-plugin",
-      "commit": "0d95a81d35a9f2d123a5e9430d1cfc43d55f1bb0",
-      "syncedAt": "2026-07-06T02:08:42Z"
     }
   ]
 }