(Photo: Serghei Gherciu) A week before Good Friday, the National Theatre in Prague premiered a “Parsifal” that seemed less a ritual of inherited faith than an inquiry into the architecture of knowledge itself. Richard Wagner’s final work–his self-styled Bühnenweihfestspiel of 1882–has always invited metaphysical inflection. In “Parsifal,” Richard Wagner distills a vast philosophical meditation into a deceptively simple narrative: A {…}