This is the common core of Ferrostar, which is shared across all platforms. The common parts of navigation logic are kept internal wherever possible, with a public interface exposed to platform-specific code via FFI bindings. Bindings are generated using UniFFI.
This is the main crate. At a high level, this defines two critical pieces: the navigation controller and routing backends, which are described in detail in the architecture section of the guide.
This crate provides a binary target, uniffi-bindgen, which generates Kotlin and Swift bindings.
You probably don't need to touch this crate. It's just here because no canonical binary exists on crates.io.