- Add terrain-compute-improved-lite.wgsl and terrain-compute-improved-heavy.wgsl
- Create TerrainShaderRegistry.ts for shader management
- Refactor TerrainComputePass to support dynamic shader switching
- Update TerritoryRenderer, TerritoryLayer, and GroundTruthData for new shader integration
- Enhance WebGPUDebugOverlay with additional debugging capabilities