Tests should leave .c files for debugging purposes.

[Salvakiya]

Description

by default the tests ought to leave the c files after running to make it easier to diagnose compiler issues.

[walker84837]

Thanks for the issue!

I actually added support for this already via an environment variable. If you run:

KEEP_C=1 cargo test

the compiler will keep the generated C files instead of deleting them.

[walker84837]

The tests invoke the compiler directly for each Kit file, so they respect its behavior and flags rather than having test-only cleanup logic. That way the test path matches actual compiler usage and is easier to reason about.

If you think the default should change or this should be documented more clearly, I'm open to that.