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": "12aa8cc0e980b6d3310a5be4f477c434da51f4b0",
-      "syncedAt": "2026-08-15T16:00:01Z"
+      "commit": "766dce6b1394ebb56a3090748d5a0240a5aefb36",
+      "syncedAt": "2026-08-17T16:00:00Z"
     },
     {
       "id": "taste-skill",
@@ -60,8 +60,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "d4fc45b1fbabfccb7a6a4333d8004cf19481caa9",
-      "syncedAt": "2026-08-14T16:00:00Z"
+      "commit": "8a7701ec27eb9cb8e0377db769fbe6d744113c52",
+      "syncedAt": "2026-08-17T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "53c9c2a5e9f1a49096324fba4f95833649c6a0f4",
-      "syncedAt": "2026-08-16T16:00:01Z"
+      "commit": "3b01e0cbe63c0dba316298e2d0aa6a09c4f3ef2d",
+      "syncedAt": "2026-08-17T16:00:00Z"
     },
     {
       "id": "grill-me",
@@ -105,8 +105,8 @@
       "repo": "https://github.com/mattpocock/skills.git",
       "ref": "main",
       "adapter": "skill-collection",
-      "commit": "068b6e0c62393147daf03530149cdce209c93da8",
-      "syncedAt": "2026-08-16T16:00:01Z"
+      "commit": "9c9f36ccd3995266cd675468af71639c8dde1ec5",
+      "syncedAt": "2026-08-17T16:00:00Z"
     },
     {
       "id": "next-skills",
@@ -114,8 +114,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "c18acf5cef6085bdf7561352be4a06acfc43b6fc",
-      "syncedAt": "2026-08-16T16:00:01Z"
+      "commit": "10439f3c6f058794f7d395dc347663271bf780ce",
+      "syncedAt": "2026-08-17T16:00:00Z"
     }
   ]
 }