It’s official: A legal settlement that will rewrite the way many real estate agents are paid in the United States has received its final approval from a federal judge. Judge Stephen R. Bough of the Western District of Missouri on Tuesday approved an agreement between the National Association of Realtors and a group of home sellers who sued the real estate trade group over its long-standing rules on agents’ commissions, which they say forced them to pay excessive fees. It was the last step in an eight-month process that was set in motion when NAR, the nation’s largest trade association, agreed to the landmark deal on March 15.