SEATTLE — The end of a Seahawks era first revealed Tuesday became official Wednesday as the team announced it has released middle linebacker Bobby Wagner. The announcement came a few hours after quarterback Russell Wilson tweeted a goodbye to Seattle, the twin pillars of the Seahawks for a decade each moving on in what will go down as one of the most momentous days in team history. Wagner was released in a move that will save $16.6 million against the salary cap in 2022. By releasing him now, the Seahawks allow Wagner to immediately become a free agent and potentially find a team before the st…