There are recitals, there are great recitals, and then there’s Yuja Wang. In an extraordinary scene Sunday in Herbst Theatre, after hearing her play the audience appeared both exhausted and elated. My hands hurt not merely from applauding, but also from an apparent case of couvade syndrome (men’s sympathy pain at childbirth) on listening to two hours of devilishly difficult Scriabin and Prokofiev played with ease and astonishing clarity.