//! Legacy types for backwards compatibility.
//!
//! This module contains deprecated type aliases and re-exports
//! to maintain backwards compatibility with code that uses the old API.
//!
//! # Migration Guide
//!
//! The following types have been superseded by equivalents in `cfgmatic-source`:
//!
//! | Legacy Type (cfgmatic-files) | New Type (cfgmatic-source) |
//! |-------------------------------|----------------------------|
//! | `ConfigFile` | `FileSource` |
//! | `ConfigFiles` | `CompositeSource` |
//! | `FileFinder` | `Loader` with `FileConfig` |
//! | `Mergeable` | Use `cfgmatic_merge::Merge` directly |