Mark completed tasks in extract-table-cell-boxes proposal: - Phase 1: Config and model caching ✓ - Phase 2: Cell boxes extraction ✓ - Phase 3: PDF generation optimization ✓ Remaining: Phase 4 (testing) and Phase 5 (cleanup) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>