No‚ Jon Stewart really wasn’t sitting at his desk at Comedy Central for the last nine years‚ waiting for someone to turn the lights back on. Yet it almost felt that way during Stewart’s return to “The Daily Show” Monday night. His signature moves — blunt satire‚ facial grimaces‚ incisive use of video and some occasional lectures — were all intact. Public figures are served notice that the media’s sharpest bull detector is back on the job. Stewart has said that the lack of a comedic outlet...