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The merge algorithm now uses 3 criteria instead of just IoU > 0.3: 1. IoU > 0.15 (relaxed threshold) 2. Center proximity < word height AND same row 3. Text similarity > 0.7 AND same row This prevents doubled overlapping words when both PaddleOCR and Tesseract find the same word at similar positions. Unique words from either engine (e.g. bullets from Tesseract) are still added. Tests expanded: 19 → 37 (added _box_center_dist, _text_similarity, _words_match tests + deduplication regression test). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>