Chief U.S. District Judge Ruben Castillo woke up on July 1, 2013, to discover he had been sent an e-mail at 12:01 a.m.The message was from his predecessor, James F. Holderman, and Holderman’s wife, Paula Hudson Holderman.The couple wished Castillo the best of luck in his new role as the top federal trial judge in the Northern District of Illinois.Five years later, Castillo said Wednesday in his annual State of the Court address, “I really look forward to sending that same message to the next chief judge of our …