CUBELinux-2
6e13b13eea
New code (no recycling from prior build). Implements: - cubecoords: Czyx 4-axis coordinate (pack/unpack u32), Null-class classification (Total / Cube 1-4 / User), TriWord tri-channel 64-bit codec (6 ASCII + 4 control bits), HeaderFlags + CubeHeader (derived flags). All coding decisions documented inline. - cubestore: CubeBackend trait, HashBackend (HashMap<u32>), CubeStore with dependency-free length-prefixed record codec (header TLV + body). - 8 unit tests, all passing; cargo test clean (0 warn/err). Per directive: separate git repo; current /home/CUBELinux kept as working tool; scoped to AI-OS-excluded PDF vision.