Update marketplace.json

Author: wkdgus1164

.claude-plugin/marketplace.json

@@ -72,6 +72,16 @@
         "name": "andy",
         "url": "https://github.com/ureca-corp"
       }
+    },
+    {
+      "name": "gh-split-pr",
+      "source": "./plugins/gh-split-pr",
+      "description": "GitHub PR을 분리하는 플러그인",
+      "version": "0.1.0",
+      "author": {
+        "name": "andy",
+        "url": "https://github.com/ureca-corp"
+      }
     }
   ]
 }