Function gdn_wy4_flag_clear 

pub fn gdn_wy4_flag_clear(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    flag: DevicePtr,
    stream: u64,
) -> Result<()>

2026-09-25: Clear a layer’s write-on-accept engaged word. The caller issues it at the start of a batched verify that requested write-on-accept, on the stream of the launches that follow.