Function dense_gemm_bf16_pipelined 

pub fn dense_gemm_bf16_pipelined(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight: &DenseWeight,
    output: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    stream: u64,
) -> Result<()>

2026-09-25: Tensor-core BF16 GEMM (kernel dense_gemm_bf16_pipelined): m16n8k16 MMAs fed by a 2-stage cp.async pipeline on a 128x128 tile, with the inputs and output layout of dense_gemm.