Pity the American office worker: overworked, undervalued and kept in the dark about the true intentions of his employer, which are somehow weirder and more odious than he could possibly know. The beauty of the corporate-culture satire “Severance” lies in just how universal, how quotidian, its protagonist’s gripes are. On some cosmic level, Mark Scout wants to investigate the aims of his mysteriously tight-lipped company. Day to day, though, he must slog away at unsatisfying and impenetrable tasks, browbeaten by a series of cold, uncaring bosses. Who hasn’t been there?