STOCKTON, Calif. — Josh Hader’s on the Astros’ radar too. Before the year is out, the lefty could well join Mark Appel with Class AA Corpus Christi. “He is young, he’s OK staying in Lancaster a little bit longer,” general manager Jeff Luhnow said Saturday. “If we didn’t have anybody right now, if our rotation wasn’t filled in Double A with guys that we like, we might move Hader a little faster.