UNSET sentinel pattern:
- Add UNSET sentinel in protocols.py for nullable field updates
- Fix inability to clear deck description (UNSET=keep, None=clear)
- Fix repository inability to clear validation_errors
Starter deck improvements:
- Remove unused has_starter_deck from CollectionService
- Add deprecation notes to old starter deck methods
Validation improvements:
- Add energy type validation in deck_validator.py
- Add energy type validation in deck schemas
- Add VALID_ENERGY_TYPES constant
Game loading fix:
- Fix get_deck_for_game silently skipping invalid cards
- Now raises ValueError with clear error message
Tests:
- Add TestEnergyTypeValidation test class
- Add TestGetDeckForGame test class
- Add tests for validate_energy_types utility function
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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