Feat/tangent umat fix

[jpsferreira]

• change 4th-order tensors to immutable
• evaluate iterators with kwargs
• test NeoHooke in isochoric space

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 88.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.4%. Comparing base (16be195) to head (cb2fd4a).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
hyper_surrogate/symbolic.py	85.7%	2 Missing ⚠️
hyper_surrogate/materials.py	90.9%	0 Missing and 1 partial ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##            main      #4     +/-   ##
=======================================
- Coverage   85.8%   85.4%   -0.5%     
=======================================
  Files          7       7             
  Lines        390     391      +1     
  Branches      69      68      -1     
=======================================
- Hits         335     334      -1     
- Misses        51      53      +2     
  Partials       4       4             

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.