fix: correct marketplace.json schema and update author

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

.claude-plugin/marketplace.json

@@ -21,7 +21,7 @@
         "documentation"
       ],
       "author": {
-        "name": "NextSystems",
+        "name": "darrenhinde",
         "url": "https://github.com/darrenhinde"
       },
       "license": "MIT",

claude-plugin/.claude-plugin/plugin.json

@@ -2,7 +2,7 @@
   "name": "oac",
   "description": "OpenAgents Control - Multi-agent orchestration and automation for Claude Code",
   "version": "1.0.0",
-  "author": "NextSystems",
+  "author": "darrenhinde",
   "license": "MIT",
   "repository": "https://github.com/darrenhinde/OpenAgentsControl",
   "tags": [