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Boxes whose vertical center falls within top/bottom 7% of image height are filtered out (page numbers, unit headers, running footers). At typical scan resolutions, 7% ≈ 2.5cm margin. Fixes: "Box 1" containing just "3" from "Unit 3" page header being incorrectly treated as an embedded box. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>