Function compat_cache_path 

pub fn compat_cache_path() -> PathBuf

Compat shard path: ~/.stryke/scripts.compat.rkyv. Parser/compiler output for the same source differs by --compat (statement-terminator rule, prototype-vs-signature dispatcher, reserved-name shadowing, …) so compat runs route to a separate shard — otherwise a --compat entry can be returned to a native run and vice versa, hiding the real behavior the user is trying to test.