smooth_step after line search for slim

[Huangzizhou]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.22%. Comparing base (0cd21ba) to head (5e8eb3d).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/polysolve/nonlinear/Solver.cpp	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
+ Coverage   81.20%   81.22%   +0.01%     
==========================================
  Files          49       49              
  Lines        2001     2008       +7     
  Branches      267      268       +1     
==========================================
+ Hits         1625     1631       +6     
- Misses        376      377       +1     

Flag	Coverage Δ
polysolve	81.22% <83.33%> (+0.01%)	⬆️

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