Archived the extract-table-cell-boxes proposal which implemented:
- Table cell boxes extraction from PP-StructureV3 table_res_list
- Layered rendering for tables with cell borders
- CV-based table line detection (disabled)
- Scan artifact removal preprocessing
- PDF orientation detection for rotated documents
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
