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": "b4531dfc05a3ef0ba93b57e8bfa5f48564a4b4d6",
-      "syncedAt": "2026-10-23T16:00:00Z"
+      "commit": "1f951fb4ad40ba63302c6e7f987147e034d599d9",
+      "syncedAt": "2026-10-24T16:00:00Z"
     },
     {
       "id": "taste-skill",
@@ -132,8 +132,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "3d98900e9b73c45f035f8109e9d41ba6a51685e7",
-      "syncedAt": "2026-10-23T16:00:00Z"
+      "commit": "ffd225775bbb7955a673f08bb9be4a63600d9dfb",
+      "syncedAt": "2026-10-24T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -168,8 +168,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "523e5bd972f94c3cac8742fec0d54d43824a17bb",
-      "syncedAt": "2026-10-23T16:00:00Z"
+      "commit": "78759bf62e9a1ef43e926ff9e50afa4cfe9a63cb",
+      "syncedAt": "2026-10-24T16:00:00Z"
     },
     {
       "id": "grill-me",
@@ -258,8 +258,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "3dd7baa502a13a96836680fa4d84cb5020ae94fc",
-      "syncedAt": "2026-10-23T16:00:00Z"
+      "commit": "a831acd90b7bb80cd284d3e7727ab8e1a0756991",
+      "syncedAt": "2026-10-24T16:00:00Z"
     },
     {
       "id": "shuorenhua",