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[bot]]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (019b6f4) 70.71% compared to head (6ee0143) 70.38%.

:exclamation: Current head 6ee0143 differs from pull request most recent head 6e05eab. Consider uploading reports for the commit 6e05eab to get more accurate results

Files	Patch %	Lines
docs/_ext/aafig.py	0.00%	6 Missing :warning:
src/tmuxp/_internal/config_reader.py	58.33%	3 Missing and 2 partials :warning:
conftest.py	33.33%	2 Missing :warning:
src/tmuxp/cli/freeze.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #907 +/- ## ========================================== - Coverage 70.71% 70.38% -0.34% ========================================== Files 26 26 Lines 1950 1955 +5 Branches 407 409 +2 ========================================== - Hits 1379 1376 -3 - Misses 448 453 +5 - Partials 123 126 +3 ```

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