Pitchfork’s wild 28-year mutation — from loudmouth upstart to bully tastemaker to critical agenda-setter to Condé Nast portfolio piece and self-anointed “most trusted voice in music” — took a dismal twist Wednesday afternoon when none other than Anna Wintour issued a memo announcing that this century’s most influential music publication would be merging with GQ. Wintour’s announcement came sprinkled with some happy talk about “new possibilities,” but the layoffs that were handed down at Pitchfork in the hours that followed — including the ouster of editor in chief Puja Patel — made it clear that an era was ending.