Function create_local_profile 

pub fn create_local_profile(
    adapters_dir: &Path,
    adapter: &str,
    profile: &str,
    overlay_toml: &str,
) -> Result<(), RegistryError>

Create (or overwrite) a local profile for adapter from a sparse overlay TOML document. Refuses an invalid name, a name that shadows a shipped profile, an overlay that fails to parse, or one that — once merged onto the parent — breaks a manifest invariant or loosens a consent floor (tighten-only). Nothing is written unless every check passes.