Fix: engine::new() visibility

[kinrezC]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d0ec29a) 16.77% compared to head (b0d0b64) 16.95%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
arbiter-macros/src/lib.rs	93.10%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #854      +/-   ##
==========================================
+ Coverage   16.77%   16.95%   +0.18%     
==========================================
  Files          39       40       +1     
  Lines       30124    30193      +69     
==========================================
+ Hits         5053     5120      +67     
- Misses      25071    25073       +2     

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