Puccini’s “Madame Butterfly,” which opened in a new production at San Francisco Opera this week, always has been a shocker. An American naval officer serving in Nagasaki signs a contract to “wed” spirited 15-year-old Cio-Cio-San (Butterfly). She wants to believe it’s a real marriage, but after a night of marital bliss, he sails away on the USS […]