SAN FRANCISCO — It took Steve Kerr a week to come to the conclusion . “I couldn’t imagine walking away from the Warriors ,” Kerr said Friday from the top floor of the Warriors’ arena, overlooking a sweeping view of the city the coach couldn’t give up. In his first public comments since signing a contract extension that will extend his tenure in Golden State for a 13th and 14th season, Kerr expressed excitement about continuing his partnership with Steph Curry , emphasized that he still has a