Non-deterministic charge validation

[jthorton]

Fixes #2115 by adding a validation method that attempts to catch partial charge generation methods which are used at runtime and are nondeterministic.

LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: yes / no
If yes, please provide details here: No

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.
• Filled in the AI generated code disclosure.

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• 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/.

[jthorton]

pre-commit.ci autofix

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.48%. Comparing base (7ff38c9) to head (3c76241).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2132      +/-   ##
==========================================
- Coverage   95.13%   90.48%   -4.65%     
==========================================
  Files         213      213              
  Lines       20878    20930      +52     
==========================================
- Hits        19862    18939     -923     
- Misses       1016     1991     +975     

Flag	Coverage Δ
fast-tests	90.48% <100.00%> (?)
slow-tests	?

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[github-actions]

No API break detected ✅

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Griffe output

$ griffe check "openfe" -s src --no-inspection --no-color --verbose -a origin/main

$ griffe check "openfecli" -s src --no-inspection --no-color --verbose -a origin/main