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- Remove all_colored spanning header heuristic that falsely flagged colored vocabulary entries (Scotland, secondary school) as headers - Add _filter_decorative_margin: removes vertical A-Z alphabet strips along page margins (single-char words in a compact vertical strip) - Add _filter_footer_words: removes page numbers in bottom 5% of page - Tighten spanning header rule: require ≥3 columns spanned + ≤3 words Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>