The Mariners don’t need a history lesson this weekend as much as they need a road correction. But, unfortunately for them, the history part is sitting right there, waving its arms and making itself impossible to ignore. Seattle opens a three-game series in St. Louis carrying one of the more frustrating splits of the season so far. 11-15 overall and just 1-8 away from home. The Cardinals, meanwhile, enter the series at 14-10 and 7-5 at home, so this isn’t exactly a soft landing spot for a team trying to stop looking uncomfortable outside T-Mobile Park.   That is what makes this weekend feel a little bigger than an early season interleague series. The Mariners have never exactly made themselves at home in St. Louis. Through the 2025 season, they were just 4-8 against the Cardinals in games played there, and for a long time, Busch Stadium was basically where the Seattle offense went to wander around with a flashlight and no plan.…