Function transpose_u8 

pub fn transpose_u8(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    src: DevicePtr,
    dst: DevicePtr,
    rows: u32,
    cols: u32,
    stream: u64,
) -> Result<()>

2026-09-25: Single-matrix uint8 transpose [rows, cols] -> [cols, rows] on the GPU (transpose_u8.cu, 32x32 shared-memory tiles). The quantized weight transposes in weight_map/quantized/transpose.rs call it.