Fix test_help_in_readme failing due to ANSI color codes in Python 3.13 argparse output

[Copilot]

Python 3.13's argparse emits ANSI color escape codes in help output when running in a color-capable environment. test_help_in_readme compares csv2ofx --help output directly against the plain-text README, causing it to fail in CI where color is enabled.

Changes

• tests/test_cli.py: Set NO_COLOR=1 in the subprocess environment when capturing --help output in test_help_in_readme, stripping ANSI codes so the output matches the README's plain text.

def test_help_in_readme():
    env = {**os.environ, "NO_COLOR": "1"}
    out = subprocess.check_output(['csv2ofx', '--help'], text=True, env=env)
    readme = pathlib.Path('README.md').read_text()
    assert out in readme, "README help is stale, please update."

Original prompt

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This section details on the original issue you should resolve

<issue_title>Failure in tests checking README usage is not stale</issue_title>
<issue_description>The test_help_in_readme has started failing with:

FAILED tests/test_cli.py::test_help_in_readme - AssertionError: README help is stale, please update.

It passes for me locally, but not in CI. The tests are explicitly disabled on Python 3.13 and earlier (due to a change in how argparser renders things). But now it appears to be failing in CI due to the presence of ANSI color control characters:

_____________________________ test_help_in_readme ______________________________

    @pytest.mark.xfail("sys.version_info < (3, 13)")
    def test_help_in_readme():
        out = subprocess.check_output(['csv2ofx', '--help'], text=True)
        readme = pathlib.Path('README.md').read_text()
>       assert out in readme, "README help is stale, please update."
E       AssertionError: README help is stale, please update.
E       assert '\x1b[1;34musage: \x1b[0m\x1b[35m\x1b[1;35mcsv2ofx\x1b[0m\x1b[35m [options] <source> <dest>\x1b[0m\n\ndescription: csv...options and arguments passed to the parser\n  \x1b[1;32m-v\x1b[0m, \x1b[1;36m--verbose\x1b[0m         verbose output\n' in '# csv2ofx\n\n[![GHA](https://github.com/reubano/csv2ofx/actions/workflows/main.yml/badge.svg)](https://github.com/reu...ed under the [MIT License](http://opensource.org/licenses/MIT), the same as [meza](https://github.com/reubano/meza).\n'

tests/test_cli.py:163: AssertionError

Probably the test should be updated to disable color output when rendering the help text.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Failure in tests checking README usage is not stale #163

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