It’s the age of artificial intelligence, and 86-year-old Marjorie — a jumble of disparate, fading memories — has a handsome new companion who’s programmed to feed the story of her life back to her. What would we remember, and what would we forget, if given the chance? In this richly spare, wondrous new play, Jordan Harrison explores the mysteries of human identity and the limits — if any — of what technology can replace.