//! Header API — uniform inbound inspection and outbound builder
//! shape.
//!
//! This module provides the four cornerstones of the gateway-grade
//! header surface introduced by `SIP_API_DESIGN_2.md`:
//!
//! - [`view::SipHeaderView`] — the trait every inbound wrapper
//! (`IncomingCall`, `IncomingRequest`, `IncomingResponse`,
//! `IncomingRegister`) implements so that B2BUA / SBC code can
//! inspect headers generically.
//! - [`options::SipRequestOptions`] — the trait every outbound and
//! response builder implements. Provides `with_header`,
//! `with_headers`, `with_raw_header`, `strip_header`,
//! `with_headers_from`, and `with_strictness` with default bodies
//! driven by [`options::BuilderHeaderState`].
//! - [`policy`] — layer-boundary enforcement: classify any header for
//! any method as `StackManaged` / `MethodShaped` /
//! `ApplicationControlled` so the dialog state machine remains
//! authoritative.
//! - [`convenience`] — typed constructors for headers without a
//! first-class `TypedHeader` variant in sip-core
//! (`Diversion`, `History-Info`, `Replaces`, …).
pub use ;
pub use ;
pub use SipHeaderView;