Function emit_claude_code_with_providers 

pub fn emit_claude_code_with_providers(
    ir: &WarbleIr,
    out_dir: &Path,
    target_id: &str,
    render_flavor: RenderFlavor,
    models: &ModelConfig,
    hybrid: HybridRealization,
    context: &ContextInjection,
    providers: &[ProviderFragment],
) -> Result<(), DispatchError>

As emit_claude_code_with_context, composing the base target with caller-supplied provider fragments. This is how a domain capability — one naming an external service rather than the runtime’s own structure — reaches this back-end without being hardcoded in it.