As long as you have a sufficient test suite you could probably run a Ralph Wiggum loop and have it brute force it. Creating the test suite would be harder though.
Farmers should be able to swap parts, tweak loads of things in software, etc without software locks. I should be able to do that on my car too. But the way to achieve that is not through spending a few hundreds of thousands of dollars on Opus [latest] and praying that doesn't kill me, that's the part I have an issue with in OPs comment.
Vibe code administrative systems for your local golf club to your hearts desire for all I care, god forbid somebody will have to stand around a bit longer before going for their 9 holes. But safety critical equipment is not the place to fuck around with the code prediction machines that have existed for 4 years, have been writing more-or-less acceptable code for 2, and will still regularly refer to themselves as MechaHitler or just make up shit. "Yes you're absolutely correct, I was wrong" doesn't help you one bit if you have just been chewed up by heavy machinery, and the fact that people like you exist who go 'oh just a few more more unit tests surely will fix it' is a terrifying thought.
If you need assurances, have a different LLM write the test suite.