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

@@ -33,8 +33,8 @@
       "repo": "https://github.com/nextlevelbuilder/ui-ux-pro-max-skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "3b5df7547964f0cb3424de74cff55b69039250d3",
-      "syncedAt": "2026-07-27T16:00:00Z"
+      "commit": "4857a2c5ef989794751a0f66b8545a4a49566286",
+      "syncedAt": "2026-07-28T15:59:58Z"
     },
     {
       "id": "caveman",
@@ -60,8 +60,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "bf906bb8aeebc64d374afb54497b822d587ac6d7",
-      "syncedAt": "2026-07-27T16:00:00Z"
+      "commit": "47c7f92dbc4dd22a29982986458787000c4e7bc1",
+      "syncedAt": "2026-07-28T15:59:58Z"
     },
     {
       "id": "frontend-slides",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "5260a14f8467e52d7fc945c5efead3e2090f0f86",
-      "syncedAt": "2026-07-27T16:00:00Z"
+      "commit": "cbb6bf9917efb18d787e510fc41a5e9e388bbdf8",
+      "syncedAt": "2026-07-28T15:59:58Z"
     },
     {
       "id": "next-skills",
@@ -105,8 +105,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "1f65c7646eb57660e4eb38899b8197346d0d93c1",
-      "syncedAt": "2026-07-27T16:00:00Z"
+      "commit": "ad618bf13fbc4be57d6b6136a20547af50708eb2",
+      "syncedAt": "2026-07-28T15:59:58Z"
     }
   ]
 }