Documents all 7 ingested sources (CFTC COT, Yahoo Finance KC=F, ICE stocks×3, USDA PSD, Open-Meteo ERA5) plus planned sources (ICE options, COT combined, World Bank Pink Sheet, FAO crop calendar). Matches padelnomics inventory format. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>