Lewis and Cos pricing and log-strike moneyness fixes

[lsbardel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 78.61272% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.92%. Comparing base (2524b4a) to head (a9d8f19).

Files with missing lines	Patch %	Lines
quantflow/utils/marginal.py	68.69%	36 Missing ⚠️
quantflow/options/pricer.py	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   85.53%   84.92%   -0.62%     
==========================================
  Files          61       61              
  Lines        3401     3462      +61     
==========================================
+ Hits         2909     2940      +31     
- Misses        492      522      +30     

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