Joe Schoen’s mission was clear yet incomplete following the NFL Draft. The general manager had fortified all but one of the consensus soft spots on the New York Giants ’ roster, and there was only one veteran free agent left on the market who could reasonably plug their hole at nose tackle. Enter D.J. Reader, whose contract was not renewed by the Detroit Lions because the team had decided to get younger and cheaper at the position. At 6-3 and 330 pounds, Reader spent his first 10 NFL seasons as a solid run-stopper, clogging the interior of the trenches for Houston (four seasons), Cincinnati (four seasons), and Detroit (two seasons). In other words, Reader is exactly what the Giants needed with the recent trade of nose tackle Dexter Lawrence to the Bengals, which only weakened a rush defense that’s been ranked no higher than 25th in the league since 2021.…