refactor: what does failure look like?

[melodywang060]

If a check throws an error, display traceback and frames where the error occurred

[gforsyth]

We need to figure out what errors ARE, what represents a failure, how much do we interfere with output in certain test types and what do we surface to a user?

This issue can be closed with a short specifications document or links to more targeted issues detailing the above.