A delightful encounter between Morocco and Brazil just wrapped up at the Meadowlands, just a short train ride from downtown Manhattan. Back across the Hudson River, a potentially decisive Game 5 of the NBA Finals will tip off soon. The World Cup final will take place back here in less than six weeks. All of a sudden, New York seems like the center of the sports world. And the city has a mayor who is taking full advantage. Zohran Mamdani has been…