Function render_auto_with_engine 

pub fn render_auto_with_engine(
    engine: &dyn TemplateEngine,
    template: &str,
    data: &Value,
    theme: &Theme,
    mode: OutputMode,
    context_registry: &ContextRegistry,
    render_context: &RenderContext<'_>,
) -> Result<String, RenderError>

Auto-dispatches rendering using a provided TemplateEngine.

This is similar to render_auto_with_context but allows using a pre-configured TemplateEngine trait object instead of creating a new dictionary-based engine.