When does an iReport give CNN’s credibility a black eye? When its citizen “journalism” about a Steve Jobs heart attack turns out to be phony. It takes a lot during this Autumn of the Economic Meltdown for an individual company’s stock woes to break out from the pack, but an Oct. 3 iReport on CNN.com claiming that Apple’s CEO had been rushed to a hospital after suffering a serious heart attack did the trick. Another news Web site, Silicon Alley Insider, ran with the story while waiting for callbacks from Cupertino and Atlanta.