Making Magic stable

MAGIC (Morgan And Grand Iron Clojure) compiles Clojure to .NET so we can run it in Unity, including on iOS. [Ramsey Nasser](https://nas.sr/about/) built it and maintained it almost single-handedly for close to a decade. With his time for it now limited, I set out to make it dependable: I consolidated his six repositories into one Flybot-owned monorepo, built the tooling and CI it lacked, and used…