Sydney Sweeney signed up for one of the biggest superhero flops in history on purpose. The flop lost Sony money. It made her career. She admitted the whole thing in GQ. "Strategic business decision," her words. Here's the play. In 2022 she had heat from Euphoria but zero leverage as a producer. Studios greenlight passion projects for people they trust, and nobody at Sony owed her anything. So she took the superhero paycheck, showed up, hit her marks, and built relationships while the movie…