“The Bleeding Class,” a new one-act drama by a rising playwright and screenwriter, Chisa Hutchinson, traces the progress of a pernicious virus clearly modeled after Covid-19. In a program note, though, its author discloses that she began work on the piece back in 2019, “months before an actual pandemic hit. It was meant to be commentary on capitalist greed and highlight folks who tend to get dehumanized by it.”