//! Photonic antenna module — optical nanoantenna theory, phased arrays,
//! LiDAR-specific OPA design, and radiation pattern analysis.
//!
//! # Sub-modules
//!
//! - [`optical_antenna`] — Hertzian dipole, nanorod, optical Yagi-Uda antenna
//! - [`phased_array`] — 1D and 2D optical phased array beam steering
//! - [`lidar_opa`] — LiDAR-optimised OPA system design and link budget
//! - [`pattern`] — Antenna pattern metrics, directivity, Friis equation
//!
//! # Physical conventions
//!
//! All spatial quantities in SI metres, frequencies in rad/s, angles in radians
//! unless explicitly suffixed `_deg`. Gains are linear (not dB) unless the
//! identifier contains `_db` or `_dbi`.
// ─── Re-exports ───────────────────────────────────────────────────────────────
pub use ;
pub use ;
pub use ;
pub use ;