SAN ANTONIO – Mike Foltynewicz’s left arm is clean, devoid of marks and color. His right arm – the limb that can crack 100 mph and has turned the 21-year-old into the most promising pitching prospect the rebuilding Astros possess – is loaded with the images, script and stories. Add in the long, wavy hair and imposing 6-foot-4, 200-pound frame, and the eye-catching numbers Foltynewicz has produced this season (3-0, 2.38 ERA, 67 strikeouts in 64 1/3 combined innings at Class high A and AA) are becoming part of his everyday story. “The first two months have been pretty exciting for me. It’s a lot of fun. It’s a great [...]