fix: correct marketplace.json schema - author must be object

- Change author from string to object with name and url
- Fixes schema validation error in Claude Code
- Required format: {"name": "...", "url": "..."}

.claude-plugin/marketplace.json

@@ -20,7 +20,10 @@
         "code-review",
         "documentation"
       ],
-      "author": "NextSystems",
+      "author": {
+        "name": "NextSystems",
+        "url": "https://github.com/darrenhinde"
+      },
       "license": "MIT",
       "repository": "https://github.com/darrenhinde/OpenAgentsControl"
     }