♻️ Create outboard blanket class

[chris-ashe]

This pull request refactors the blanket geometry and pumping power calculation logic in the blanket library and its users. The main improvements are the introduction of dedicated InboardBlanket and OutboardBlanket classes with clearer geometry calculation methods, and the refactoring of the pumping power calculation into a function with explicit arguments and return values. These changes increase modularity, clarity, and maintainability of the code, especially for the DCLL and HCPB blanket models.

Refactoring and modularization of blanket geometry:

• Introduced new InboardBlanket and OutboardBlanket classes in blanket_library.py, each encapsulating their respective geometry calculations, and updated DCLL and HCPB blanket models to inherit from these classes instead of the generic BlanketLibrary (process/blanket_library.py, process/dcll.py, process/hcpb.py). [1] [2] [3] [4] [5]
• Moved the calculation of toroidal segment lengths for inboard and outboard blankets into dedicated methods (set_blanket_inboard_module_geometry, set_blanket_outboard_module_geometry) and updated their usage in DCLL and HCPB run methods (process/blanket_library.py, process/dcll.py, process/hcpb.py). [1] [2] [3]
• Removed the direct calculation of segment lengths from set_blanket_module_geometry, delegating this responsibility to the new methods and the respective blanket classes (process/blanket_library.py).

Refactoring of pumping power calculation:

• Refactored set_pumping_powers_as_fractions from a state-mutating function to a pure function with explicit arguments and return values, improving clarity and testability. Updated all usages to unpack the returned tuple and assign the results (process/blanket_library.py, process/dcll.py, process/hcpb.py). [1] [2] [3]

Code cleanup and logic improvements:

• Removed redundant or now-unnecessary calls to geometry setup methods in the thermo-hydraulic model, as this is now handled in the blanket-specific classes (process/blanket_library.py).

These changes collectively make the codebase more modular, easier to extend for new blanket types, and clearer in terms of data flow and responsibility separation.## 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 31.42857% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.56%. Comparing base (26bfc59) to head (95da307).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
process/blanket_library.py	30.43%	16 Missing ⚠️
process/dcll.py	33.33%	4 Missing ⚠️
process/hcpb.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3997      +/-   ##
==========================================
- Coverage   46.03%   43.56%   -2.48%     
==========================================
  Files         123      123              
  Lines       28964    30818    +1854     
==========================================
+ Hits        13335    13427      +92     
- Misses      15629    17391    +1762     

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