- Added `owned_regions` attribute to the Avatar class to track regions owned by avatars.
- Introduced `occupy_region` and `release_region` methods for managing region ownership and ensuring proper relationship handling.
- Updated AvatarManager to clear relationships when an avatar is released, ensuring no lingering references.
- Refactored region ownership logic in the Occupy action and Simulator to utilize the new methods for better clarity and maintainability.
- Enhanced game loading process to establish ownership relationships correctly during game state restoration.
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