Function cutlass_bf16_proj 

pub fn cutlass_bf16_proj(
    gpu: &dyn GpuBackend,
    derived: &DerivedWeights,
    act: DevicePtr,
    fp8w: &Fp8Weight,
    out: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    stream: u64,
) -> Result<()>

2026-09-25: Route a projection out[M,N] = act[M,K] @ weightᵀ through CUTLASS BF16, against the FP8 weight’s memoized BF16 copy.