Anthony Volpe is ready to return to the majors, and yet he remains in the minors. In a surprising development, given how Volpe has been treated since winning the everyday job in spring training 2023, the Yankees are not (yet) simply handing him back the reins to one of the most prized positions in baseball. At least for the moment, the Yankees have a full-blown shortstop competition. With José Caballero sizzling, Volpe will remain with Double-A Somerset at least through Sunday, manager Aaron Boone said, at which point the Yankees will have exhausted the 20 days Volpe is allowed to participate in a rehab assignment. By Monday, the Yankees will have to decide whether to bring Volpe back to the majors — and if so, in what role — or whether to formally option him to the minor leagues, a step never taken in Volpe’s three major league seasons even through lengthy struggles. During the majority of those seasons, though, the Yankees did not have Caballero or any legitimate alternative option at shortstop.…