I know very little about game development. My retro 4X remake now has animated turn playback, a parallax starfield, a working AI planner, and 221 new passing tests anyway, thanks to one session with Claude Fable 5 and seven agents running in parallel. Also included: the difficulty system we caught making easy mode stronger than hard.
How a single commit across 58 files added audio, branching tech trees, fleet stances, galaxy types, diplomacy treaties, and 22 achievements to Third Conflict. Everything kept green the whole way.