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

@@ -117,14 +117,23 @@
       "commit": "fcbde2e9cfa14f3fd2e154d7bef6bd264da61fcd",
       "syncedAt": "2026-09-17T16:00:00Z"
     },
+    {
+      "id": "artemis-case-prep",
+      "pluginName": "artemis-case-prep",
+      "repo": "https://git.playones.com/hejunxian/artemis-case-prep.git",
+      "ref": "v1.0.0",
+      "adapter": "claude-skill",
+      "commit": "94200db05a6b4d046222879b87672d45d791e756",
+      "syncedAt": "2026-09-24T09:40:56Z"
+    },
     {
       "id": "artemis-automation",
       "pluginName": "artemis-automation",
       "repo": "https://git.playones.com/chenmingxuan/Artemis-Eapil.git",
-      "ref": "v1.1.1",
+      "ref": "v1.1.2",
       "adapter": "claude-skill",
-      "commit": "8522fa3ca3e341034325bf4844624d0893217e79",
-      "syncedAt": "2026-09-24T03:13:04Z"
+      "commit": "0e13bb5c2927bb9e858ace4f43ab9f479ba55c61",
+      "syncedAt": "2026-09-24T09:40:56Z"
     },
     {
       "id": "embedded-app-pc-debug",
@@ -159,8 +168,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "e71848173cf199bb56e88c1c04aa977cdb0a84df",
-      "syncedAt": "2026-09-24T03:13:04Z"
+      "commit": "76117ccd71fdfaf4d5377b7ed08d238de845321b",
+      "syncedAt": "2026-09-24T09:40:56Z"
     },
     {
       "id": "shuorenhua",