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": "20442886c5cfb440441c35030462fbdf64838655",
-      "syncedAt": "2026-07-20T16:00:00Z"
+      "commit": "3f47b9113a173bac4a72cefda4d4c3f2d89b8ab6",
+      "syncedAt": "2026-07-22T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -78,8 +78,8 @@
       "repo": "https://github.com/op7418/guizang-ppt-skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "82fe5ae129e8c2a12e1155fcabed6703342749d6",
-      "syncedAt": "2026-06-11T03:57:53Z"
+      "commit": "929c2ecb63a22b54d400c4911ed70bf96c2b355d",
+      "syncedAt": "2026-07-22T16:00:00Z"
     },
     {
       "id": "html-ppt",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "07d83e5a31a2830cc6c314377463e523a76e28fc",
-      "syncedAt": "2026-07-21T16:00:00Z"
+      "commit": "89759436bd336beed3a32da15830355bf732b14e",
+      "syncedAt": "2026-07-22T16:00:00Z"
     },
     {
       "id": "next-skills",
@@ -105,8 +105,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "93c59f02f81cfdeb0fc397412897024ae7c68074",
-      "syncedAt": "2026-07-21T16:00:00Z"
+      "commit": "63f14c6c90c4dae819966e180491eb9b0af16792",
+      "syncedAt": "2026-07-22T16:00:00Z"
     }
   ]
 }