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/Yeachan-Heo/oh-my-codex.git",
       "ref": "main",
       "adapter": "codex-plugin",
-      "commit": "304fb3b4825c4132c273732b14d2d5e86b54f8e3",
-      "syncedAt": "2026-09-07T16:00:01Z"
+      "commit": "cb955b0d5becbef76d2c1f0096b6e1f238e1e7f7",
+      "syncedAt": "2026-09-11T16:00:01Z"
     },
     {
       "id": "ui-ux-pro-max",
@@ -105,8 +105,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "09ad58f0d58decc9d30799ca83374ff2604ef16b",
-      "syncedAt": "2026-09-10T23:40:59Z"
+      "commit": "b3073f8fcf5d2ebeda621a424097dde9dd771cea",
+      "syncedAt": "2026-09-11T16:00:01Z"
     },
     {
       "id": "grill-me",
@@ -141,8 +141,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "ccef3db535aa163a883f6ac000bdceb16b13e5e5",
-      "syncedAt": "2026-09-10T23:40:59Z"
+      "commit": "d155ba9ebfffe4742efefda8d68c2e0e8e490924",
+      "syncedAt": "2026-09-11T16:00:01Z"
     },
     {
       "id": "shuorenhua",