Function w8a16_gemv_batch2 

pub fn w8a16_gemv_batch2(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight: DevicePtr,
    block_scale: DevicePtr,
    output: DevicePtr,
    n: u32,
    k: u32,
    stream: u64,
) -> Result<()>

2026-09-25: Launches a batch-2 block-scaled FP8 GEMV. No kernel under kernels/ defines a w8a16_gemv_batch2 entry point.