K3 GPU beta: f_θ+S5 K/V-Restoration verifier — incremental decode (=AR) + DFlash fused spec-decode (>AR) on Gemma 4 26B-A4B

K3 GPU beta: f_θ+S5 K/V-Restoration verifier — incremental decode (=AR) + DFlash fused spec-decode (>AR) on Gemma 4 26B-A4B #76