STEP TF turn structure

[chris-ashe]

Description

This pull request adds support for a new "step-stacked tape" type to the superconducting toroidal field (TF) coil modeling, along with the necessary data fields and model registration. The changes ensure the new coil type is selectable, its parameters are tracked, and its model is properly invoked in the workflow.

Support for Step-Stacked Tape TF Coil:

• Added STEPSuperconductingTFCoil to the imports and model registration in main.py, and included it in the list of models for execution.
• Updated the model selection logic in caller.py to call the new step_sctfcoil model when the STEP_STACKED_TAPE turn type is selected.
• Allowed the new turn type to be selected as input by adding value 3 to the i_tf_turn_type choices in input.py.

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.

[github-actions]

⚠️ improve_quality_job warning!

Files changed by this PR have introduced 6 more linting errors when compared to main

Please fix these

To check what these are, run hatch run lint:fmt_extra on your branch and on main

[ajpearcey]

no units denoted by [-]

[ajpearcey]

When itart == 1 include the centre column length cplen is not included in len_tf_coil. This is accounted for else where or is copper the missing?

[ajpearcey]

This is true of all the masses in section. I can see some if statements for itart == 1. Also is it useful to list, list the copper masses, without the centre rod included? Are the centre rod masses/area calculated as well, we these will be needed for costing or other engineering models.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 38.29268% with 253 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.86%. Comparing base (9919d95) to head (465f636).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/tfcoil/superconducting.py	42.85%	184 Missing ⚠️
process/core/io/plot/summary.py	2.98%	65 Missing ⚠️
process/core/caller.py	0.00%	2 Missing ⚠️
process/models/tfcoil/base.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4643      +/-   ##
==========================================
- Coverage   49.92%   49.86%   -0.06%     
==========================================
  Files         151      151              
  Lines       30236    30821     +585     
==========================================
+ Hits        15094    15369     +275     
- Misses      15142    15452     +310     

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