fix: remove redundant hooks reference from plugin.json

hooks/hooks.json is auto-loaded by Claude Code, specifying it in
manifest.hooks causes duplicate loading error.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cahaseler

.claude-plugin/plugin.json

@@ -25,6 +25,5 @@
     "./agents/comment-compliance-reviewer.md",
     "./agents/duplication-detector.md",
     "./agents/dead-code-detector.md"
-  ],
-  "hooks": "./hooks/hooks.json"
+  ]
 }