Find nearest Simvue config in nested directories

[kzscisoft]

Find simvue.toml in nested directories

Issue: N/A

Python Version(s) Tested: 3.13

Operating System(s): Ubuntu 25.10

📝 Summary

Locates simvue.toml from parent as well as current directories.

🔄 Changes

Expanded find_first_instance_of_file.

✔️ Checklist

• Unit and integration tests passing.
• Pre-commit hooks passing.
• Quality checks passing.
• Updated the documentation.

[james-panayis]

I've made a slight tweak so that it doesn't keep endlessly rechecking the root dir ("/") if the user has read access all the way up to it. It'd be good to have a test that hits that case (which I think is quite common). I'd probably do it by mocking .parent to return self, but there's other ways it could be done too.

This seems to work exactly as expected now, and will be extremely useful for users 😄