Janet Robinson, 61, who has been New York Times Co. chief executive since 2004, is retiring at the end of the year. The Times says it will begin an internal and external search to find a new CEO. Meanwhile, Times publisher Arthur O. Sulzberger Jr. will serve as interim chief executive officer. || The Times will pay Robinson $4.5 million over the next year for “consulting services.” || Gawker’s Hamilton Nolan has the memos and newsroom reaction. || Ira Stoll: Robinson will earn almost as much as a retired consultant as she did as a full-time CEO.