Polarized channels

[rozyczko]

Enhancements to Polarized Neutron Reflectometry and Magnetism:

• Full support for all four polarization channels (pp, pm, mp, mm) in the refl1d calculator, including new APIs and improved handling of magnetic layers and their properties. This includes new classes (LayerMagnetism, PolarizedDataSet) and channel-aware accessors.
• Improved magnetic depth profile computation, more robust spin asymmetry calculations, and caching for polarized cross-sections to optimize performance.
• New and improved methods for fitting polarized datasets, reporting, and handling of magnetic parameters and edge cases.

[codecov]

Codecov Report

❌ Patch coverage is 95.53571% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.69%. Comparing base (299127d) to head (f9a4442).

Files with missing lines	Patch %	Lines
src/easyreflectometry/summary/summary.py	80.00%	12 Missing ⚠️
src/easyreflectometry/project.py	96.74%	8 Missing ⚠️
...rc/easyreflectometry/calculators/refl1d/wrapper.py	95.72%	5 Missing ⚠️
src/easyreflectometry/data/polarized.py	96.42%	4 Missing ⚠️
...ctometry/sample/elements/layers/layer_magnetism.py	91.66%	3 Missing ⚠️
src/easyreflectometry/calculators/factory.py	91.66%	1 Missing ⚠️
src/easyreflectometry/fitting.py	99.08%	1 Missing ⚠️
.../easyreflectometry/sample/elements/layers/layer.py	96.29%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #393      +/-   ##
===========================================
+ Coverage    92.99%   93.69%   +0.70%     
===========================================
  Files           48       51       +3     
  Lines         3852     4519     +667     
===========================================
+ Hits          3582     4234     +652     
- Misses         270      285      +15     

Flag	Coverage Δ
integration	30.69% <23.85%> (-0.91%)	⬇️
unittests	93.69% <95.53%> (+0.70%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/easyreflectometry/calculators/__init__.py	66.66% <100.00%> (+1.96%)	⬆️
...c/easyreflectometry/calculators/calculator_base.py	100.00% <100.00%> (+1.21%)	⬆️
src/easyreflectometry/calculators/polarization.py	100.00% <100.00%> (ø)
...easyreflectometry/calculators/refl1d/calculator.py	100.00% <ø> (ø)
src/easyreflectometry/calculators/refnx/wrapper.py	100.00% <ø> (+1.61%)	⬆️
src/easyreflectometry/calculators/wrapper_base.py	100.00% <100.00%> (+1.38%)	⬆️
src/easyreflectometry/data/__init__.py	100.00% <100.00%> (ø)
src/easyreflectometry/limits.py	100.00% <100.00%> (ø)
src/easyreflectometry/model/model.py	96.99% <100.00%> (+0.06%)	⬆️
src/easyreflectometry/sample/__init__.py	100.00% <100.00%> (ø)
... and 8 more

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