Extract EPD fields from PDFs and write the EPD Library workbook with declared and slab-scaled rows.
Reads epd-products.json and epd-download.json, extracts A1-A3 GWP, declared unit, and density from each downloaded EPD PDF via wine2o2, scales declared-unit and dimension-based slab rows, and writes epd-library.xlsx plus epd-library.md under /workspace/work/outputs/. Never invents GWP values or density.