`config.rs` is already quite long without these definitions. Since they have no real dependencies of their own, let's move them to their own file so `config.rs` can focus on the business logic of loading a config.
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Though for non-Rust UIs, we are also working to define a protocol for talking to Codex. See:
You can use the proto subcommand using the executable in the cli crate to speak the protocol using newline-delimited-JSON over stdin/stdout.