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

@@ -114,8 +114,8 @@
       "repo": "https://github.com/JuliusBrussee/caveman.git",
       "ref": "main",
       "adapter": "codex-plugin",
-      "commit": "1f951fb4ad40ba63302c6e7f987147e034d599d9",
-      "syncedAt": "2026-10-24T16:00:00Z"
+      "commit": "9b68f7ed12b05e7efaff18e65c5a3fc2849fd0a4",
+      "syncedAt": "2026-10-25T16:00:00Z"
     },
     {
       "id": "taste-skill",
@@ -123,8 +123,8 @@
       "repo": "https://github.com/Leonxlnx/taste-skill.git",
       "ref": "main",
       "adapter": "skill-collection",
-      "commit": "6010f91a9935f1c167dfc500fb1a475681892e6b",
-      "syncedAt": "2026-10-21T06:48:34Z"
+      "commit": "12af471f627f866411b4bd785b19646d3672784c",
+      "syncedAt": "2026-10-25T16:00:00Z"
     },
     {
       "id": "shadcn",
@@ -132,8 +132,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "ffd225775bbb7955a673f08bb9be4a63600d9dfb",
-      "syncedAt": "2026-10-24T16:00:00Z"
+      "commit": "481d523374745e77d0cf9c53a4115ab5dd7c8481",
+      "syncedAt": "2026-10-25T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -258,8 +258,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "a831acd90b7bb80cd284d3e7727ab8e1a0756991",
-      "syncedAt": "2026-10-24T16:00:00Z"
+      "commit": "cbf49db30a655ac17c92c2951885c4256db14b9e",
+      "syncedAt": "2026-10-25T16:00:00Z"
     },
     {
       "id": "shuorenhua",