Function emit_claude_code_with_native_host 

pub fn emit_claude_code_with_native_host(
    ir: &WarbleIr,
    out_dir: &Path,
    target_id: &str,
    render_flavor: RenderFlavor,
    models: &ModelConfig,
    hybrid: HybridRealization,
    context: &ContextInjection,
    providers: &[ProviderFragment],
    purpose: Option<NativePurpose>,
    native_scope: Option<NativeSessionScope>,
    native_mcp: Option<NativeMcpDescriptor>,
    native_host: Option<NativeHost>,
) -> Result<(), DispatchError>

Explicit native host execution; old entry points still reject all component calls.