Optional GEOGRAPHY / GEOMETRY function pack for Frostlake (TO_GEOGRAPHY, the ST_ family, HAVERSINE companions), contributed to the engine via the FunctionProvider ServiceLoader SPI. The engine keeps only the type surface; add this module to the classpath to enable geospatial SQL. The spherical model is live-verified against Snowflake (R = 6371010 m exactly). Dependency-free beyond the engine itself.