WASHINGTON — Christine Blasey Ford emotionally recounted for a rapt Senate committee Thursday her memory of Supreme Court nominee Brett Kavanaugh sexually assaulting her at a summer gathering of teenagers in 1982.The details of Ford’s account are by now familiar, but her nationally televised testimony — four hours that included a vehement denial that she could be confused about Kavanaugh’s identity — rocked a hearing that will determine Kavanaugh’s ambition to join the Supreme Court.“I am here today not because I want to be,” Ford, a California psychology professor, said at the beginning of her testimony before the Senate Judiciary Committee.