- Add TagRow and RarityTagBudgetRow implementing GameFramework IDataRow
- Migrate TagGenerationRule and RarityTagBudgetRule to Domain layer
- Migrate TagGenerationRuleRegistry and RarityTagBudgetRuleRegistry
to use IEnumerable<TagRow> instead of DRTag
This establishes the foundation for DR migration: L0 now has pure C#
IDataRow implementations while L1 will provide DataRowBase wrappers.
Co-Authored-By: Claude <noreply@anthropic.com>
