Add examples that test STL integration

[mborland]

Closes: #89

[cppalliance-bot]

An automated preview of the documentation is available at https://91.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.

2026-02-18 18:34:14 UTC

[codecov]

Codecov Report

❌ Patch coverage is 86.48649% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.4%. Comparing base (883067c) to head (42f72e0).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
examples/std_numeric_usage.cpp	86.5%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #91     +/-   ##
=========================================
- Coverage     98.5%   98.4%   -0.0%     
=========================================
  Files          114     115      +1     
  Lines         7522    7559     +37     
  Branches      2593    2611     +18     
=========================================
+ Hits          7404    7436     +32     
  Misses          43      43             
- Partials        75      80      +5     

Files with missing lines	Coverage Δ
examples/std_numeric_usage.cpp	86.5% <86.5%> (ø)

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