[DNM] test to see if new number solver works in openfe

[mikemhenry]

Checklist

• All new code is appropriately documented (user-facing code must have complete docstrings).
• Added a news entry, or the changes are not user-facing.
• Ran pre-commit: you can run pre-commit locally or comment on this PR with pre-commit.ci autofix.

Manual Tests: these are slow so don't need to be run every commit, only before merging and when relevant changes are made (generally at reviewer-discretion).

• GPU integration tests
• example notebook testing
• packaging tests: run this for any large feature PRs or PRs that add test data.

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

🚨 API breaking changes detected! 🚨
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[IAlibay]

@mikemhenry none of our tests would catch this properly - the only way we would know is by running actual simulations.

[mikemhenry]

GPU tests: https://github.com/OpenFreeEnergy/openfe/actions/runs/21968465241

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.98%. Comparing base (ad07917) to head (545fd33).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1843      +/-   ##
==========================================
- Coverage   95.22%   92.98%   -2.25%     
==========================================
  Files         204      204              
  Lines       17623    17623              
==========================================
- Hits        16781    16386     -395     
- Misses        842     1237     +395     

Flag	Coverage Δ
fast-tests	92.98% <ø> (?)
slow-tests	?

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[IAlibay]

GPU tests: https://github.com/OpenFreeEnergy/openfe/actions/runs/21968465241

They aren't going to be enough in this case - the memory issues we've had in the past are when you run a full length simulation.

[mikemhenry]

I'm not trying to validate this accelerator in just this PR, but these tests will catch issues with env solving, code bugs, etc.