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

@@ -51,8 +51,8 @@
       "repo": "https://github.com/Leonxlnx/taste-skill.git",
       "ref": "main",
       "adapter": "skill-collection",
-      "commit": "dfb6f9f9e93a39f673b1827c0889cc28326d1800",
-      "syncedAt": "2026-08-18T16:00:00Z"
+      "commit": "843c8dd4d18ccff0d5a9cd4b0b71d7dbf7278293",
+      "syncedAt": "2026-08-21T15:59:59Z"
     },
     {
       "id": "shadcn",
@@ -60,8 +60,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "19b67204fb80b7a7c233c967e4cf3aed73810f80",
-      "syncedAt": "2026-08-21T06:41:32Z"
+      "commit": "c06da1d0e91e97b607d1359372347528bb35b090",
+      "syncedAt": "2026-08-21T15:59:59Z"
     },
     {
       "id": "frontend-slides",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "fb6e5ac969bb066f1f6fa5dcd14349f0813e9e7a",
-      "syncedAt": "2026-08-21T06:41:32Z"
+      "commit": "cdabb4e5e0703651f88738df8b5f43eaee7fd50c",
+      "syncedAt": "2026-08-21T15:59:59Z"
     },
     {
       "id": "grill-me",
@@ -105,8 +105,8 @@
       "repo": "https://github.com/mattpocock/skills.git",
       "ref": "main",
       "adapter": "skill-collection",
-      "commit": "0ab1b63a410a03d3627979a109c8695de27af954",
-      "syncedAt": "2026-08-20T16:00:00Z"
+      "commit": "5b15a47f2d7150f545fbcacbfe381787fc0230dc",
+      "syncedAt": "2026-08-21T15:59:59Z"
     },
     {
       "id": "next-skills",
@@ -114,8 +114,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "14a69ef78b94c9bdb68b2f1d5d1a55599ff8022c",
-      "syncedAt": "2026-08-21T06:41:32Z"
+      "commit": "1c86b8a4fa3bb8795e25fd49bbbd10844dd83263",
+      "syncedAt": "2026-08-21T15:59:59Z"
     }
   ]
 }