Magnitude FC input changes from h_s2[B, SH2] to [h_s2; Q_dir][B, SH2+3]. Direction E[Q] values (3 scalars per sample) are computed from branch 0 logits and concatenated. w_b1fc grows by 3*adv_h parameters (768 for AH=256). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>