Sonya Yoncheva’s first-ever Princess Romazov was one of this summer’s casualties but Trove Thursday steps up with a rare 1960 in-house pirate of Giordano’s Fedora starring Renata Tebaldi, Giuseppe di Stefano and Tito Gobbi along with a pair of Tebaldi-di Stefano Puccini highlights from the early 1950s.