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//! # gmgn — Rust Reinforcement Learning Gymnasium
//!
//! A pure-Rust library for reinforcement learning environments, inspired by
//! [Gymnasium](https://gymnasium.farama.org/). Designed for zero-cost
//! abstraction and idiomatic Rust ergonomics.
//!
//! ## Quick Start (static, generic)
//!
//! ```rust
//! use gmgn::prelude::*;
//! use gmgn::envs::classic_control::{CartPoleEnv, CartPoleConfig};
//!
//! let mut env = CartPoleEnv::new(CartPoleConfig::default()).unwrap();
//! let reset = env.reset(Some(42)).unwrap();
//!
//! for _ in 0..200 {
//! let action = env.action_space().sample(&mut gmgn::rng::create_rng(None));
//! let step = env.step(&action).unwrap();
//! if step.terminated {
//! break;
//! }
//! }
//! ```
//!
//! ## Quick Start (dynamic, registry)
//!
//! ```rust
//! use gmgn::registry::{self, DynValue};
//!
//! registry::register_builtins();
//! let mut env = registry::make("CartPole-v1").unwrap();
//! env.reset_dyn(Some(42)).unwrap();
//! let step = env.step_dyn(&DynValue::Discrete(1)).unwrap();
//! ```