Function blk128x128_stride_ok 

pub fn blk128x128_stride_ok(k: usize) -> bool

2026-09-25: Whether L = ceil(k / 128) is a multiple of 4, the condition under which the checkpoint’s row-major weight-scale grid is passed to the BLK128x128_32F operand unchanged. The cuBLASLt dispatch gates check it (dense_ffn_w8a8_prefill.rs, dispatch_proj_decode.rs).