Lewis — International Economics Analysis Platform
Bulk data export. Each data/<key>.csv is the exact panel the
website serves, with a provenance header line. MANIFEST.json
lists every dataset's source, units, row count and column schema.
Sources: BEA, FRED, U.S. Treasury, ONS, Bundesbank, World Bank, IMF, OECD.
Re-derive from source with webapp/data_pipeline/build_cache.py.
