@spec check_toolchain!(BurritoNg.Builder.Target.t()) :: [{String.t(), String.t()}]

Verifies the Rust toolchain can build a wrapper for target, raising with instructions if not. Returns the linker environment to pass to Cargo.

Called before any phase runs, so a missing toolchain fails the build early.

@spec clean(BurritoNg.Builder.Context.t()) :: :ok

Removes the build outputs of the wrapper crate (including the embedded payload) for the context's target, keeping its compiled dependencies cached.

@spec target_dir(BurritoNg.Builder.Context.t()) :: String.t()

The Cargo target directory used for wrapper builds. It is kept between builds so the wrapper's dependencies are only compiled once.

@spec wrapper_binary_path(BurritoNg.Builder.Context.t()) :: String.t()

Path of the wrapper binary produced by execute/1 for the context's target.