- Bounty.created_by_user_id is now non-optional (always required)
- Removed is_group from RoomData (negative room_id is self-documenting)
- Added room_id to TrackedBounty to track which room bounty was tracked from
- Added clarifying docstrings explaining TrackingData vs TrackedBounty
- Updated tests to match new model structure
- Remove GroupBounty/PersonalBounty subclasses, use Bounty with optional created_by_user_id
- Combine UserData/GroupData into RoomData with room_id and is_group fields
- Add group_id field to TrackingData (supports negative Telegram group IDs)
- Add test_bounty_comparison_not_equal for verifying different bounties are not equal
- Update core/__init__.py exports