Function options_for_provider_ref 

pub fn options_for_provider_ref(
    config: &Config,
    name: &str,
    fallback: &ModelProviderRuntimeOptions,
) -> ModelProviderRuntimeOptions

Options to use when building a provider from a name that may be either a bare family or a dotted alias. Dotted names yield alias-resolved options; bare names inherit only provider-agnostic settings from fallback.