HOUSTON—When it comes to dynamic duos, there’s often a clear-cut top dog and a trusty sidekick. That’s not the case with second baseman Jose Altuve and shortstop Carlos Correa, Houston’s middle-infield combo who both shine equally bright for the Astros. “A lot of times you have one All-Star caliber (player) and like a … Robin,” manager Dusty Baker said. “But this time you’ve got two Batmans.” The pair played its 66th postseason game together on Saturday, which is the most by any shortstop and second base duo in MLB history. The two cornerstones of the franchise, or to use Baker’s term, the team’s vertebrae, have played together since Correa’s debut in 2015, a year that featured their first trip to the postseason. Altuve doesn’t recall a specific conversation they had back then about their expectations for the future, but he knows they often discussed “winning and playing together for a …