Implements Phase 2 foundational components:
- VagabondActor document class with item management, resource tracking,
damage/healing, rest mechanics, and combat helpers
- VagabondItem document class with chat card generation and item usage
- Comprehensive dice rolling module (d20 checks, skill/attack/save rolls,
damage with crit doubling, countdown dice, morale checks)
- Quench tests for all dice rolling functions
Fixes Foundry VTT v13 compatibility issues:
- Add documentTypes to system.json declaring valid Actor/Item types
- Fix StringField validation errors by using nullable/null pattern
instead of blank string choices for optional fields
- Update actor tests to use embedded documents for slot calculations
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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