Porting TurboQuant to CUDA

TurboQuant (ICLR 2026) compresses transformer KV caches using Walsh-Hadamard rotation plus Lloyd-Max quantization. 2-5x compression, minimal quality loss. The paper shipped with a llama.cpp fork that had Metal kernels but no CUDA support. I spent 12 days porting it. 140 commits, 6 PRs, two overnight runs of an automated optimizer that found a 3.5x speedup nobody would have written by hand. the…