Function provider_runtime_options_for_agent 

pub fn provider_runtime_options_for_agent(
    config: &Config,
    agent_alias: &str,
) -> ModelProviderRuntimeOptions

Resolve ModelProviderRuntimeOptions from an agent’s model_provider alias ("<type>.<alias>"). Returns safe defaults when the agent alias doesn’t exist, doesn’t have a model_provider set, or names a non-existent entry.