Revert "Drop clang-13, 14, and 15 due to consteval ICE"

[mborland]

This reverts commit e0ec3bc.

[cppalliance-bot]

An automated preview of the documentation is available at https://121.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.

2026-02-26 18:19:27 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.7%. Comparing base (67fdbf5) to head (2d9f1d6).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #121   +/-   ##
=======================================
  Coverage     97.7%   97.7%           
=======================================
  Files          106     106           
  Lines         7280    7280           
  Branches      2684    2684           
=======================================
  Hits          7109    7109           
  Misses         103     103           
  Partials        68      68           

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