Hours after the U.S. and Israel began bombing Iran, a writer in Tehran texted me. “The war has started,” he wrote, followed later by an animated emoji of an arm emerging from a puddle of green slime to flash a thumbs-up. I had first connected with the writer, whom I will call Hadi, in late January. Hadi was part of a broader group of Iranian dissidents who had spent much of their adult lives toggling between imprisonment and self-imposed invisibility.