729ebff63c
- Add _filter_border_ghost_words() to remove OCR artefacts from box borders (vertical + horizontal edge detection, column cleanup, re-indexing) - Add 20 tests for border ghost filter (basic filtering + column cleanup) - Add 24 tests for cv_graphic_detect (color detection, word overlap, boxes) - Clean up cv_graphic_detect.py logging (per-candidate → DEBUG) - Add structure overlay layer to StepReconstruction (boxes + graphics toggle) - Show border_ghosts_removed badge in StepStructureDetection - Update MkDocs with structure detection documentation Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>