Tron: Ares ’s vision of what’s to come is as upbeat as we can ask for, I guess. Photo: Leah Gallo/Disney When you sit back and take them all in together, the Tron movies aren’t a cohesive series so much as they’re like a set of artifacts about the gradual demise of technological optimism. That initial 1982 feature, in all its Day-Glo eight-bit glory, was about a battle over authorship — the triumph of a visionary coder over the less talented C-suite member who stole his work. That it also