fix: add Enzyme backend into ClosedFormStrategy

[Nimrais]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.42%. Comparing base (b41491b) to head (05dbbf8).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #92   +/-   ##
=======================================
  Coverage   99.41%   99.42%           
=======================================
  Files          14       14           
  Lines         517      520    +3     
=======================================
+ Hits          514      517    +3     
  Misses          3        3           

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