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

@@ -42,8 +42,8 @@
       "repo": "https://github.com/JuliusBrussee/caveman.git",
       "ref": "main",
       "adapter": "codex-plugin",
-      "commit": "17f9f2ec2377b0bfe16b52ee03a462e7f0a02bc8",
-      "syncedAt": "2026-08-27T16:00:00Z"
+      "commit": "df2ccd85c94ec3c8289cb62ac020d241ccfb0c60",
+      "syncedAt": "2026-08-30T16:00:00Z"
     },
     {
       "id": "taste-skill",
@@ -60,8 +60,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "683a5a9b370acdb7785a0529434e6a3b8c7e0441",
-      "syncedAt": "2026-08-26T16:00:00Z"
+      "commit": "b4a618b97e35f5dadf3a00d51f410c84a2567d4d",
+      "syncedAt": "2026-08-30T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "bf81f3ece547e769095a6c0b82f40d33be3d2cf7",
-      "syncedAt": "2026-08-29T16:00:00Z"
+      "commit": "035fdad700fa38071c46ec698c9d810f6ec103ec",
+      "syncedAt": "2026-08-30T16:00:00Z"
     },
     {
       "id": "grill-me",
@@ -114,8 +114,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "7421a868ad7eb878efcaa27cbc280b39e72ed757",
-      "syncedAt": "2026-08-29T16:00:00Z"
+      "commit": "2fe6f962a1982594bdda96a7de16c594677266d2",
+      "syncedAt": "2026-08-30T16:00:00Z"
     }
   ]
 }