If you thought you knew A.R. Gurney, you’re in for a bit of a surprise. Final Follies, Primary Stages’ collection of three Gurney one-acts, reveals facets of the late, beloved playwright that steer clear of the collective impression of him. Yes, WASPs frequent the stage, though not exclusively, and Gurney is concerned as usual with questions of status, repression, and traditions passed on from generation to generation. But he wanders into what seems very un-Gurney territory—with uneven but often beguiling results.