(Photo credit: Bernd Uhlig) The man who gave the opera world its most dazzling 21st century “Parsifal,” Stefan Herheim, continues his quest to interrogate the Romantic text that is Richard Wagner’s “Ring of the Nibelungen.” Inspired refreshing of a 150-year-old work of art can provide new insights and flashes of illumination. But conceptual pyrotechnics can just as easily destroy its {…}