SANTA FE — Ryan Stewart says he knows what it’s like to begin the school year in front of 30 students who want to know how much homework you’re going to assign. Now he begins the school year with a new challenge — as Gov. Michelle Lujan Grisham’s pick to lead the state Public Education Department. She dismissed his predecessor, Karen Trujillo, just three weeks ago for failing to meet her expectations. Stewart wasn’t a candidate the first time Lujan Grisham hired a public education secretary. But the governor said Monday that she’s confident his skills will be an asset...