- Created TradingCardMod.Tests.csproj with xUnit for testable components
- Extracted CardParser.cs with pure parsing logic (no Unity deps)
- Extracted TradingCard.cs data class from ModBehaviour
- Added 37 unit tests covering parsing, validation, rarity mapping
- Updated cards.txt format with optional description field
- Fixed DLL references (explicit HintPath for paths with spaces)
- Fixed Harmony UnpatchAll API usage
- Updated CLAUDE.md with test commands and current project status
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Co-Authored-By: Claude <noreply@anthropic.com>