//! Repetitive control, 2-DOF control, and feedforward controllers.
//!
//! This module provides advanced control structures for periodic disturbance
//! rejection and decoupled reference tracking:
//!
//! - [`RepetitiveController`]: Plug-in repetitive controller for periodic
//! disturbance rejection based on the internal model principle
//! - [`ModifiedRepetitiveController`]: Modified repetitive controller with
//! zero-phase 3-tap FIR robustness filter
//! - [`TwoDofController`]: ISA standard 2-DOF PID controller separating
//! reference tracking from disturbance rejection
//! - [`ReferencePrefilter`]: First-order reference prefilter for step smoothing
//! - [`InversionFeedforward`]: Dynamic inversion feedforward for first-order plants
//! - [`PolynomialFeedforward`]: Velocity/acceleration feedforward for smooth trajectories
pub use ;
pub use ;
pub use ;