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

@@ -24,8 +24,8 @@
       "repo": "https://github.com/Yeachan-Heo/oh-my-codex.git",
       "ref": "main",
       "adapter": "codex-plugin",
-      "commit": "afc3980e024cb31c74ad32e91ed4ac55051f16e9",
-      "syncedAt": "2026-09-06T15:59:59Z"
+      "commit": "304fb3b4825c4132c273732b14d2d5e86b54f8e3",
+      "syncedAt": "2026-09-07T16:00:01Z"
     },
     {
       "id": "ui-ux-pro-max",
@@ -42,8 +42,8 @@
       "repo": "https://github.com/JuliusBrussee/caveman.git",
       "ref": "main",
       "adapter": "codex-plugin",
-      "commit": "5184b3d11ac6a1acb7d44b9bfaa31698157cff97",
-      "syncedAt": "2026-09-05T16:00:00Z"
+      "commit": "15581d14007fd01fb3f132016741962f34936ca2",
+      "syncedAt": "2026-09-07T16:00:01Z"
     },
     {
       "id": "taste-skill",
@@ -96,8 +96,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "d3d81fe3cf4cc642de225159586308bbe98eeb4d",
-      "syncedAt": "2026-09-05T16:00:00Z"
+      "commit": "44d32733ff4180a32ab0c6a2fd062954168d8721",
+      "syncedAt": "2026-09-07T16:00:01Z"
     },
     {
       "id": "grill-me",
@@ -123,8 +123,8 @@
       "repo": "https://git.playones.com/chenmingxuan/EP-Hub-Skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "5f9951aa6e249f86ebc84b1a12ba8e9e94ba3786",
-      "syncedAt": "2026-09-04T16:00:00Z"
+      "commit": "0b133bff5e797a67c09234928d603008cce14b4d",
+      "syncedAt": "2026-09-07T16:00:01Z"
     },
     {
       "id": "next-skills",
@@ -132,8 +132,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "4fed8eaf197aaa60fd85371352482199a4c2107f",
-      "syncedAt": "2026-09-06T15:59:59Z"
+      "commit": "e9c16094f2d3c950c8ad6218e464c3f4f9c1ac67",
+      "syncedAt": "2026-09-07T16:00:01Z"
     },
     {
       "id": "shuorenhua",