Paul Feig’s adaptation of Freida McFadden’s The Housemaid promises pulp thrills — desperate maid versus unhinged housewife in a Long Island McMansion. Sydney Sweeney plays Millie, probation-bound and jobless until Amanda Seyfried’s Nina Winchester hires her to tend house and child. What begins as servitude spirals into psychological warfare, sexual tension, and gasp-worthy twists. Feig, king of…