revert: remove hooks declaration - auto-loaded by convention

Claude Code automatically loads hooks/hooks.json if it exists.
Declaring it in plugin.json causes "Duplicate hooks file" error.

Fixes #52

.claude-plugin/plugin.json

@@ -23,6 +23,5 @@
     "best-practices"
   ],
   "commands": "./commands",
-  "skills": "./skills",
-  "hooks": "./hooks/hooks.json"
+  "skills": "./skills"
 }