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Replace rigid uniform grid with bottom-up approach that derives row boundaries from word vertical centers: - Group words into line clusters, compute center_y per cluster - Compute pitch (distance between consecutive centers) - Detect section breaks where gap > 1.8× median pitch - Place row boundaries at midpoints between consecutive centers - Per-section local pitch adapts to heading/paragraph spacing - Validate ≥85% word placement, fallback to gap-based rows Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>