Gold edged higher as traders looked ahead to potential interest-rate signals from the Federal Reserve’s annual gathering in Jackson Hole, as well as high-stakes diplomacy in Washington over efforts to end the war in Ukraine. Bullion traded near $3,350 an ounce, stuck in a narrow range over the past few sessions. Central bankers from around the world will gather at the retreat in Wyoming starting Friday, with market pricing suggesting that a reduction in US rates is likely at the Fed’s policy