- roxlap-formats: voxlap on-disk parsers (.vxl/.kv6/.kvx/.kfa) + edit API
  - roxlap-core:    pure-Rust opticast+grouscan engine, x86_64 SSE2 +
                    aarch64 NEON + wasm32 simd128, rayon multicore, KV6
                    sprites, KFA animation, world voxel lighting, textured
                    sky
  - roxlap-cavegen: procedural Worley+Perlin cave generation packed into
                    voxlap slabs