I don’t suspect that “Who killed Miss Grundy?” is going to ignite the same sort of pop-culture furor as “Who killed Laura Palmer?” – but Archie’s former teacher (and, in this steamier CW adaptation of the Archie comic universe, his lover as well) was indeed killed last week in this show’s Season 2 premiere. The culprit, who shot (but not fatally) Archie’s father in last season’s finale, is now known as the Black Hood. But, for now, that