The eponymous briny-buttery bivalves are now found on every raw-bar menu in the Hub that’s worth its weight in shellfish. But somehow they still taste best at this glistening, modern seafood showplace with guaranteed real estate in the restaurant pantheon of New Classics. We sup. (That lobster roll.) We sip. (If only all oyster bars had a spirit list like this.) We sigh with delight, every time.