Function gdn_carry_conv_flush 

pub fn gdn_carry_conv_flush(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    state_table: DevicePtr,
    table_layer_entries: u64,
    conv_stash: DevicePtr,
    stash_layer_elems: u64,
    slot_tab: DevicePtr,
    pend: DevicePtr,
    pend_layer_entries: u32,
    stash_seq_elems: u32,
    batch_size: u32,
    dim: u32,
    d_conv: u32,
    layers: u32,
    stream: u64,
) -> Result<()>

2026-09-26: Standalone conv fold (gdn_carry_conv_flush) over layers GDN layers, laid out as in gdn_carry_flush with conv-state pointers and a BF16 stash.