Function build_registry 

pub async fn build_registry(
    config: &LoadedConfig,
) -> Result<(Arc<ProviderRegistry>, TurnConfig)>

Assembles the provider registry and default turn config.

Entry point for the main binary:

let (registry, turn_config) = defect_cli::providers::build_registry(&config).await?;
DefaultAgentCore::builder().registry(registry).config(turn_config)...