I test the hot-reload system end-to-end against a real dependency.

HotReloadTest is a path dep under fixtures/ with a struct (Config) and a struct caller (Builder). Examples modify its source, verify the change took effect, then revert. Running examples leaves no traces.

All mutation examples go through with_reload/3 which handles the write-compile-revert cycle. Each example only specifies what to change and what to observe.