Wall-time A/B/C/E/E' variants over equal simulated duration, reusing run_refined_dfg setup functions. Fresh state and identical warm-up per repeat, 3 interleaved repeats, construction/JIT, warm-up and bitwise population/NaN-mask parity checks outside timed regions. B, C and E' are labelled timing-only (no valid force history). No numerical or production change. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>