replay_window reconstructed fires from ALL setup versions, so liq1/vr1/run1/pm1 (refuted shadow tracks, never traded live, 8:1 volume vs v1, tight-stop artifacts) dominated /backtest: 17k trades / 45 sessions at -1.8R/trade — garbage scale vs the harness-validated -0.08R/fire. reconstruct_fires_from_setups gains an optional setup_version filter (default None: experiments unchanged); replay_window pins it to v1. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>