//! Coordinate transformations and projections.
//!
//! This module provides tools for converting between coordinate
//! systems and computing geographic distances and bearings.
//!
//! # Overview
//!
//! - Coordinate system conversions (WGS84, Web Mercator, UTM)
//! - Geodesic distance calculations
//! - Bearing and destination calculations
// TODO: Phase 3 implementation (alongside indexing)