The final season of “Succession” is here. The first episode premiered March 26, and it opened with another birthday party for family patriarch Logan Roy (Brian Cox). Unlike some of the other parties where we’ve seen him (who could ever forget Kendall’s rap tribute to his dad?), almost all his kids aren’t there. Conor (Alan Ruck) is holding down the fort, since Kendall (Jeremy Strong), Roman (Kieran Culkin), and Shiv (Sarah Snook) are far away, plotting against him. But seeing Logan in his…