Comment by observationist

Do a structured code review, with a few passes by Claude or Codex. Have it provide an annotated justification for each test, and flag tests with redundant, low, or no utility within the context of the rest of the tests. Anything that looks questionable to you, call it out on the next pass, and if it's not justified by the time you fully understand the tests, nuke it.

You could automate this, but you'll end up getting rid of useful tests and keeping weird useless ones until the AI gets better at nuance and large codebases.