//! Semantic diagram model types.
//!
//! This module contains the semantic representation of diagrams after parsing and elaboration.
//! These types represent the fully resolved, type-checked diagram structure before it is
//! transformed into a hierarchy and laid out for rendering.
//!
//! # Pipeline Position
//!
//! ```text
//! Source Text
//! ↓ lexer
//! Tokens
//! ↓ parser
//! Parser AST (parser_types) - syntactic structure with spans
//! ↓ desugar + validate + elaborate
//! Semantic Model (these types) - resolved types, validated references
//! ↓ structure
//! Hierarchy Graph (DiagramHierarchy)
//! ↓ layout
//! Positioned Elements (LayeredLayout)
//! ↓ export
//! SVG
//! ```
//!
//! # Organization
//!
//! - [`diagram`] - Core diagram structures: [`Diagram`], [`Scope`], [`Block`], [`LayoutEngine`]
//! - [`element`] - Diagram elements: [`Node`], [`Relation`], [`Fragment`], [`Note`], etc.
pub use *;
pub use *;