//! MLS Chapter 8: Equations
//!
//! This module tests conformance to MLS 3.7-dev Chapter 8, which defines:
//! - §8.1 Equation Categories
//! - §8.2 Flattening and Lookup in Equations
//! - §8.3 Equations in Equation Sections
//! - §8.4 Synchronous Data-Flow Principle
//! - §8.5 Events and Synchronization
//! - §8.6 Initialization
//!
//! Reference: https://specification.modelica.org/master/equations.html