LOS ANGELES (AP) — “Oppenheimer,” a solemn three-hour biopic that became an unlikely billion-dollar box-office sensation, was crowed best picture at a 96th Academy Awards that doubled as a coronation for Christopher Nolan. The most closely watched contest of the Academy Awards went to Emma Stone, who won best best actress for her performance as Bella Baxter in “Poor Things.” Christopher Nolan and Cillian Murphy have won their first Oscars. Robert Downey Jr. won best supporting actor at the Academy Awards, notching his first Oscar and handing the 58-year-old actor a crowning moment in an up-and-down career. Protests over Israel’s war in Gaza snarled traffic around the Academy Awards on Sunday, slowing stars’ arrival at the red carpet and turning the Oscar spotlight toward the ongoing conflict.