Function cublas_fp8_rowwise_proj 

pub fn cublas_fp8_rowwise_proj(
    gpu: &dyn GpuBackend,
    derived: &DerivedWeights,
    act_bf16: DevicePtr,
    act_fp8_scratch: DevicePtr,
    act_scale_scratch: DevicePtr,
    fp8w: &Fp8Weight,
    out: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    stream: u64,
) -> Result<()>

Route a projection through ROW-WISE native-FP8 cuBLASLt (the fp8 path GB10 supports). Weight is re-quantized once to per-row fp8 (cached); the activation is quantized per-token each call. ~1.8× the bf16 path (152 vs 85 TF), and frees the bf16-dequant memory the bf16 path holds. act_fp8_scratch ≥ m*k fp8 bytes; act_scale_scratch ≥ m f32 (e.g. the buffers.fp8_act / fp8_act_scale arena buffers).