Pairs <hash>_src / <hash>_clean outputs, computes SSIM + detail/resolution
proxies, ranks the worst-preserved images for visual classification. Used to
characterize the classes the SDXL scrub degrades (line-art, faces, dense text).
Operates on gitignored data/spaces only; writes nothing tracked.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>