Reality slips and slides in Happy as Lazzaro (“Lazzaro Felice”), the third feature from Italian film-maker Alice Rohrwacher, a curious, engrossing magic realist drama animated by cycles of power, class and history. The film seems to hang continuously in the air, suspended and provisional. On an Italian country estate named Inviolata (“unviolated”: a virginal space, a fake Paradise of simple toil), generations of sharecroppers work pitiless schedules, harvesting tobacco for the owner, the cartoonishly imperious Marchesa Alfonsina De Luna (Nicoletta Braschi), receiving no wages and chipping away at a perma-debt that holds them captive. The crisp visual textures and cramped…