Constraint vars dataclass

[clmould]

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.51724% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.94%. Comparing base (d7449c3) to head (d563d7e).

Files with missing lines	Patch %	Lines
process/core/scan.py	0.00%	8 Missing ⚠️
process/models/fw.py	0.00%	1 Missing ⚠️
process/models/stellarator/coils/calculate.py	0.00%	1 Missing ⚠️
process/models/stellarator/stellarator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4250      +/-   ##
==========================================
- Coverage   50.99%   50.94%   -0.05%     
==========================================
  Files         151      151              
  Lines       29772    29744      -28     
==========================================
- Hits        15181    15153      -28     
  Misses      14591    14591              

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