No one understood me in 2019 and certainly no one understands now (because, well, basically no one saw the movie), but it bears repeating: Will Smith’s run-and-gun two-hander Gemini Man is good, actually. The Tubi audience seems to agree: As of this week, Smith’s action vehicle is blowing up on the free-to-watch streaming service where overlooked box-office bombs are regularly reborn like cable classics. I’m happy to see it, but saddened that no…