* Notes * Half a dozen Adler Fellows put on Hugo Weisgall's The Stronger and Mozart's The Impresario at Livermore Valley Opera last Sunday. Pianist Tamara Sanikidze played the astringent music with aplomb, and Leah Crocetto managed to command attention despite how unsympathetic the character of Estelle could be. Maya Lahyani acted the mute role of Lisa…