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Even after multi-criteria matching, near-duplicate words can slip through (same text, centers within 30px horizontal / 15px vertical). The new _deduplicate_words() removes these, keeping the higher-confidence copy. Regression test with real session data (row 2 with 145 near-dupes) confirms no duplicates remain after merge + deduplication. Tests: 37 → 45 (added TestDeduplicateWords, TestMergeRealWorldRegression). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>