Investigate and document what happens if user doesn't use device_error_context

[mborland]

Closes: #163

[cppalliance-bot]

An automated preview of the documentation is available at https://166.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.

2026-04-07 19:10:18 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.9%. Comparing base (ab747ea) to head (ee44630).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #166   +/-   ##
=======================================
  Coverage     96.9%   96.9%           
=======================================
  Files          121     121           
  Lines         9356    9356           
  Branches      3537    3537           
=======================================
  Hits          9058    9058           
  Misses         232     232           
  Partials        66      66           

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