STOCKTON — It was opening day, and Lynn Schimpf was ready.She showed up to Stockton Ballpark on Thursday under cloudy but nonthreatening skies, wearing a bright blue Ports sweatshirt and cap, and carrying her new scorebook as she sat down just to the third-base side of home plate along with her husband, Paul.The Stockton residents have this routine down as fans for at least 40 years, and wouldn’t consider missing an opening day.