FRISCO, Texas — Jerry Jones isn’t shy about his end goal. “My goal in life is to retire as the owner to win the most Super Bowls,” Jones said. “So I got work to do.” That work now starts on the defensive side of the ball — again. The Cowboys are searching for their next defensive coordinator, the franchise’s fourth in four seasons, as Jones and the front office attempt to stabilize a unit reshaped by change, draft capital, and one of the most debated decisions of the past year.