When Chris Nolan wrapped Tenet in 2919, actor Robert Pattinson gave him a book of J. Robert Oppenheimer speeches as a parting gift. That tome led Nolan to Kai Bird and Martin J. Sherwin’s “American Prometheus: The Triumph and Tragedy of J. Robert Oppenheimer.” For the next three years, Nolan used the Pulitzer Prize-winning biography as the foundation for what critics are hailing as his most mature, emotional work.