Organize repository structure: clean up root directory
Major reorganization to improve clarity and maintainability:
## Documentation
- Created new simple README.md focused on Layer 1
- Added docs/ARCHITECTURE.md explaining multi-layer design
- Moved LAYER1_REBUILD.md -> docs/LAYER1.md
- Archived old documentation to docs/archive/:
- CHANGELOG.md, QUICKSTART.md, STATUS.md, USAGE.md
- DESIGN.md, README_CONFIG.md, ROADMAP.md, TECHNICAL_REVIEW.md
- claude.md, test-mcp.sh
## Source Code
- Moved unused .rs files to src/tmp/:
- ai_interpreter.rs (Layer 2 - future)
- companion.rs (Layer 4b - future)
- game_formatter.rs (Layer 4a - future)
- memory.rs (old implementation)
- extended.rs (old MCP server)
## Result
Clean root directory with only essential files:
- README.md (simple, Layer 1 focused)
- Cargo.toml
- .gitignore
- docs/ (organized documentation)
- src/ (active code only)
All Layer 1 functionality remains intact and tested.
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