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

@@ -60,8 +60,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "4c43e943d7998be45bbb5a2606e095bbf1ffaa8a",
-      "syncedAt": "2026-09-02T16:00:01Z"
+      "commit": "71e50952fbb7eda2c992660d36cd58671a2edf42",
+      "syncedAt": "2026-09-03T02:28:39Z"
     },
     {
       "id": "frontend-slides",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "1fd7ba6a72dfea7918106b4da7c665a58321454e",
-      "syncedAt": "2026-09-02T16:00:01Z"
+      "commit": "06abd6ed41a6d066f1be035852432f127687de0e",
+      "syncedAt": "2026-09-03T02:28:39Z"
     },
     {
       "id": "grill-me",
@@ -123,8 +123,8 @@
       "repo": "https://git.playones.com/chenmingxuan/EP-Hub-Skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "af8596a8a251c6a783b2f44a45047bebb2a7d68a",
-      "syncedAt": "2026-09-02T16:00:01Z"
+      "commit": "76cb0846d42e24bec29fbb3e3a39ea7f4338424e",
+      "syncedAt": "2026-09-03T02:28:39Z"
     },
     {
       "id": "next-skills",
@@ -132,8 +132,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "5cca033c416427f26dbfc7baecb0ecfbb9757e41",
-      "syncedAt": "2026-09-02T16:00:01Z"
+      "commit": "69ec884e44d1050013724facfe452248e5b9de55",
+      "syncedAt": "2026-09-03T02:28:39Z"
     }
   ]
 }