Toughen rough linting

[tony]

Changes

ruff linting

flake8-commas (COM)

• https://docs.astral.sh/ruff/rules/#flake8-commas-com
• https://pypi.org/project/flake8-commas/

flake8-builtins (A)

• https://docs.astral.sh/ruff/rules/#flake8-builtins-a
• https://pypi.org/project/flake8-builtins/

flake8-errmsg (EM)

• https://docs.astral.sh/ruff/rules/#flake8-errmsg-em
• https://pypi.org/project/flake8-errmsg/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (30fb44c) 75.09% compared to head (632308c) 75.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #307   +/-   ##
=======================================
  Coverage   75.09%   75.09%           
=======================================
  Files           5        5           
  Lines         269      269           
=======================================
  Hits          202      202           
  Misses         67       67           

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