Validated on the 4x T4 server (round 2): p.hkl, p_model.pdb, MR_* and the candidate table
identical on 9zlo/9s02/9gjx/4nwv against round 1 on 1 and 4 cards; 4nwv on 4 cards 140.8 -> 127.9 s
wall (MR 34.0 -> 21.2 s; rotation 18.4 -> 4.8 s), 9zlo/9s02/9gjx 1-3% faster. Conflicts were the
crash fix both branches carry: the branch's side taken (the per-card Reserve of the device test).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PXc1zD1yxHqaR1DGdCTHL4