Function run_setup_agent 

pub async fn run_setup_agent(
    config: &Config,
    store: &FsConfigStore,
    memory: Arc<dyn Memory>,
    build_brains: impl Fn(&Config, &Arc<dyn Memory>, bool) -> HashMap<String, Vec<Arc<dyn Brain>>>,
) -> Result<()>

Run the conversational setup. Falls back to a minimal interactive flow if no Brain is reachable.