Function q8_1_scratch_bytes 

pub fn q8_1_scratch_bytes(m: u32, k: u32) -> usize

2026-09-25: q8_1 activation scratch bytes for [m, k]: 4 bytes per value with k rounded up to 256, plus 1 MiB. ffn_act_q8 in gpu-runtime/src/buffers/sizes.rs uses the same expression with k the larger of the hidden and intermediate sizes.