hooks.json files rely on CLAUDE_PLUGIN_ROOT env var without fallback

Question

## Bug

All hooks.json files in plugins/ use  in command paths. If this env var is not set at runtime, all hook paths will break. A fallback mechanism or validation would prevent this.

hooks.json files rely on CLAUDE_PLUGIN_ROOT env var without fallback

Bug\n\nAll hooks.json files in plugins/ use in command paths. If this env var is not set at runtime, all hook paths will break. A fallback mechanism or validation would prevent this.