Drift Checks for a Self-Hosting Compiler

[MAGIC](https://github.com/flybot-sg/magic) is a compiler. It turns Clojure into .NET so Clojure can run in Unity, even on iOS. To do its job, it commits some of its build outputs straight into the repo, including the compiler's own compiled files. Those files can quietly fall out of sync with their source, and a normal build never notices. This post is about the small CI check that catches that,…