After laying low during primary-campaign season, Mayor Eric Adams is once again the most important man in New York City. He may have also been the second-happiest person to see Tuesday’s shock primary-election results. Faced with the very real possibility of avowed socialist Zohran Mamdani taking the reins of the nation’s biggest city, Adams knows that a broad swath of voters will give him a second look — and maybe, after a bumpy term in office, a second chance. For all of Mamdani’s impressive success, he collected 432,305 of the primary’s first-rank choices (with 93% of the vote counted). But...