//! Migration-only compatibility surface.
//!
//! This module exists to keep the CLI cutover and legacy contract tests moving
//! while high-level `im-core` services absorb the remaining bridge behavior. It
//! is intentionally outside the stable SDK surface: do not re-export it from
//! `prelude`, do not mirror it into Dart facade models, and do not rely on it
//! for semver-stable application code.