Round 18 blitz: per-stream gr_norm_comb 5.09x (-80%), xprep float4 (-46.8%), moe_combine_sh (-49%), Q6_K moe_gu NE>=3 (-25%), qsa_topk2/qsa_score (-5..9%) -> 40.03 tok/s decode & 445.79 tok/s 10.18K prefill