On Wednesday, Portland Opera has announced the names of the artists that are set to join its 2018-19 Resident Artist Program. They include soprano Helen Huang, mezzo-soprano Camille Sherman, tenor Thomas Cilluffo, and baritone Geoffrey Schellenberg; both Huang and Cilluffo are returning artists. Huang made her debut with Portland Opera during the 2018 Big Night Concert and appeared in such works as “Rigoletto,” “La {…}