On Nov. 21, 2021, the San Francisco Opera unveiled Michael Cavanagh’s new production of “Così fan tutte’  that rocked with energy, gaiety, verve, and abundance. The production worked on all fronts. The stage design, created by Erhard Rom, featured the so-called Wolfbridge Country Club, in the 1930s, complete with Fitness Center, Ballroom,  Badminton Court, and Swimming Pool, unfolded lively and {…}