Update some constraints vars

[chris-ashe]

This pull request focuses on standardizing and updating variable names across the codebase and input files for improved clarity and consistency, especially for constraint and physics-related parameters. It also updates documentation to reflect these new names and ensures all example input files use the revised identifiers.

Variable Renaming and Consistency

• Updated variable names in process/core/input.py and all example input files to use clearer, more descriptive identifiers for key constraints and physics parameters, such as:
  • fdene → f_nd_plasma_electron_limit_max
  • fiooic → f_j_tf_wp_critical_max
  • psepbqarmax → p_div_bt_q_aspect_rmajor_max_mw
  • nflutfmax → flu_tf_neutron_fast_max
  • f_alpha_energy_confinement_min → f_t_alpha_energy_confinement_min
  • zeff_max → n_charge_plasma_effective_vol_avg_max
  • aplasmin -> rminor_min
  • avail_min -> f_t_plant_available_min
  • fradpwr -> f_p_plasma_seperatrix_rad_max
  • pseprmax -> p_plasma_separatrix_rmajor_max_mw

Documentation Updates

• Updated all relevant documentation files to reference the new variable names and provide accurate descriptions of their usage and default values, ensuring alignment with code changes.

Example Input File Modernization

• Refactored all example input files to use the new variable names, ensuring they are compatible with the updated code and documentation.

Minor Improvements

• Clarified comments and docstrings for improved readability in the codebase.

These changes collectively improve the maintainability and clarity of the codebase by enforcing consistent naming conventions and ensuring that documentation and examples are up to date.

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 88.43537% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.89%. Comparing base (d84e9dd) to head (611674f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
process/core/solver/constraints.py	42.85%	8 Missing ⚠️
process/models/physics/exhaust.py	33.33%	4 Missing ⚠️
process/core/scan.py	66.66%	1 Missing ⚠️
process/models/physics/physics.py	0.00%	1 Missing ⚠️
process/models/stellarator/coils/calculate.py	0.00%	1 Missing ⚠️
process/models/stellarator/coils/output.py	0.00%	1 Missing ⚠️
process/models/stellarator/stellarator.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4299      +/-   ##
==========================================
+ Coverage   48.86%   48.89%   +0.02%     
==========================================
  Files         151      151              
  Lines       29461    29448      -13     
==========================================
+ Hits        14397    14399       +2     
+ Misses      15064    15049      -15     

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