Add CUDA support for signed integers

[mborland]

Closes: #169

[cppalliance-bot]

An automated preview of the documentation is available at https://174.safe-numbers.prtest3.cppalliance.org/libs/safe_numbers/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-04-08 19:15:13 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.6%. Comparing base (6fad832) to head (fea54be).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #174   +/-   ##
=======================================
  Coverage     97.6%   97.6%           
=======================================
  Files          166     166           
  Lines        12670   12670           
  Branches      4660    4660           
=======================================
  Hits         12356   12356           
  Misses         247     247           
  Partials        67      67           

Files with missing lines	Coverage Δ
...boost/safe_numbers/detail/signed_integer_basis.hpp	84.1% <100.0%> (ø)

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