It’s been a whole decade since Halloween has not had its accompanying season of American Horror Story, Ryan Murphy and Brad Falchuk’s outré horror anthology series. (The global pandemic wound up being scarier than any ghost, ghoul, or whatever that weird sex monster in Hotel was.) But just because this year’s installment of Murphy’s spooky flagship series has been sidelined doesn’t mean he can’t still bring the horror. This year his Halloween treat comes in the form of Ratched, a pseudo-origin story for the masochistic nurse in Ken Kesey’s One Flew Over …