pub fn tgemm_kernel(gpu: &dyn GpuBackend) -> KernelHandleExpand description
2026-09-25: The N128/M64 tile GEMM. Prefers w4a16_gemm_t_p3; takes
w4a16_gemm_t when METRALE_NO_TGEMM_PIPELINE3 is set to any value
(0 included) or the target lacks _p3.