Allow fixture and marker listing without required plugin options - #15158

🤖 Written by Claude Opus 5.5 via Claude Code for the pytest maintainers; I prompted it, it did the work, I read it.

Closing this. It's a half-done fix for the wrong problem.

Flipping required = False on every parser action whenever --fixtures/--markers shows up doesn't make those modes work. It just moves the failure. Plugins that declared an option required=True now get None for it, so a conftest whose pytest_configure uses the value (e.g. config.getoption("server").split(":")) goes from a clean usage error to an INTERNALERROR ... AttributeError: 'NoneType' under pytest --fixtures. The change also mutates shared argparse state from inside an action, relies on when argparse checks required internally, and has an untested pre-relax branch that has no effect (with it disabled, all of the new tests still pass).

The direction for #3042 is to deprecate required=True for pytest options and document checking for missing values in a hook and raising pytest.UsageError, so informational modes keep working. We'll follow up with a PR for that.

Thanks for the effort anyway.

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