//! Task sequencing: predecessor/successor links, lag, and cycles.
//!
//! ## Internal split
//!
//! - `relation.rs`: `IfcRelSequence`, `IfcLagTime`, and the bounded graph walk.
//! - `lag.rs`, `graph.rs`: planned owners, kept for when lag arithmetic and
//! graph algorithms outgrow the relation reader.
pub
pub use ;