- Fix skinLayersIndex for 1.21.9+ (index 16 instead of 17)
- Fix shoulderIndex offset for 1.21.9+
- Refactor Viewable to use shared ExecutorService
- Add CopperGolemState and WeatheringCopperState enums
- Register copper_golem entity type for 1.21.9+
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Co-Authored-By: Claude <noreply@anthropic.com>