Improve missing argument error message

[gordonwatts]

Summary

• include the function name and source call when raising the required-argument ValueError so users get actionable context
• assert the detailed error message in the required argument test to demonstrate the new messaging

Testing

• black --check .
• flake8
• pytest

---

https://chatgpt.com/codex/tasks/task_e_68d2bbfe5b6083208ac2937947a55a5b

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.45%. Comparing base (6032d7c) to head (d3a6f26).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #203   +/-   ##
=======================================
  Coverage   97.45%   97.45%           
=======================================
  Files          15       15           
  Lines        1454     1456    +2     
=======================================
+ Hits         1417     1419    +2     
  Misses         37       37           

Flag	Coverage Δ
unittests	97.45% <100.00%> (+<0.01%)	⬆️

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