INGOLSTADT, Germany — German automaker Audi said Friday it has reached an agreement for a full takeover of the Sauber team ahead of its entry as a full Formula 1 constructor in 2026. Audi said Sauber’s current majority shareholder Islero Investments backed Audi’s plans for a full takeover of the Sauber holding company. Former McLaren team principal Andreas Seidl is …