TriBeCa neighbors are hailing Jay-Z as a Hurricane Sandy guardian angel. Though Jay is said to have sought refuge uptown, and was spotted with Beyoncé and Blue Ivy at the Mandarin Oriental following the storm, the word around TriBeCa is that the hip-hop mogul and part owner of the Brooklyn Nets bought a generator to power 195 Hudson St., where he and Beyoncé own a nearly $7 million loft. The Web site TribecaCitizen.com also noted the chatter, but when we put it to Jay’s rep, we simply got a “no comment.” Yesterday, Jay, along with Bruce Springsteen, performed at a rally for President Obama in Ohio, leading up to today’s election.