//! # nereids-fitting
//!
//! Optimization engine for fitting resonance models to measured transmission data.
//!
//! ## Modules
//! - [`active_mask`] — Active-bin masking for fit-energy-range restriction
//! - [`error`] — Error types for the fitting crate
//! - [`forward_model`] — Solver-agnostic forward model trait
//! - [`joint_poisson`] — Joint-Poisson profile binomial deviance (counts path)
//! - [`lm`] — Levenberg-Marquardt least-squares optimizer
//! - [`nelder_mead`] — Bounded Nelder-Mead polish optimizer
//! - [`parameters`] — Fit parameter types, bounds, constraints
//! - [`poisson`] — Poisson-likelihood optimizer for low-count data
//! - [`transmission_model`] — Transmission forward model adapter for fitting
//!
//! ## SAMMY Reference
//! - Fitting: `fit/` module, `fitAPI/`, manual Sec. IV
//!
//! ## TRINIDI Reference
//! - `trinidi/reconstruct.py` for Poisson-likelihood and APGM approach