Decision log

Architecture Decision Records capture choices that affect public behavior or future integration.

• ADR 001 — monorepo, FastAPI, and MkDocs Material
• ADR 002 — USDA Soil Data Access as the first provider
• ADR 003 — in-process cache, deferred database, and public read-only CORS

Future records will cover new conversions, provider licensing, persistent/PostGIS storage, authenticated API keys, comparison semantics, and breaking API versions.