- Update design.md with MessagePack component requirements
- Add ADR-012 to architecture.md regarding public type requirements
- Add MessagePackAnalyzer to OECS.csproj for compile-time validation
Initializes the OECS repository with the core foundation, including:
- Entity management with 24-bit IDs and 8-bit versioning
- Sparse set-based component storage
- Entity allocation and recycling logic
- Core World API for entity and component lifecycle
- Project scaffolding for source and unit tests
- Design documentation and architecture decision records (ADRs)