//! Multi-agent orchestration: chains, graphs, DAGs, and workflows.
//!
//! - [`Chain`] runs steps sequentially, passing context from one to the next.
//! - [`Graph`] runs nodes with conditional routing, cycles, and fan-out/fan-in
//! (Pregel / sequential walker model).
//! - [`Dag`] performs topological scheduling: independent nodes execute in
//! parallel, with cycle detection at build time (AllPredecessor model).
//! - [`Workflow`] extends the DAG model with field-level data mapping between
//! nodes, inspired by Eino's typed-field workflow engine.
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