Convert the single binary crate into a Cargo workspace with two members: sunbeam-sdk (library) and sunbeam (thin binary). Moves build.rs to the SDK with adjusted .git/HEAD path for the nested layout.
Convert the single binary crate into a Cargo workspace with two members: sunbeam-sdk (library) and sunbeam (thin binary). Moves build.rs to the SDK with adjusted .git/HEAD path for the nested layout.