Forcing `--capture=sys` without passing the CLI flag seems impossible?

• a detailed description of the bug or problem you are having
  i want to dynamically force capsys in certain specialized cases (specifically using an os.fork()ing process spawning backend in tractor) but haven't been able to figure out a way using what i thought should be the right hook: pytest_load_initial_conftests().

• output of pip list from the virtual environment you are using
  don't think this is relevant? (but i'll put it if y'all think it's not just noise)

• pytest and operating system versions

  • pytest 8.3.5 (yeah yeah i know i gotta update 😝)
  • nixos.

• minimal example if possible

  i have the above hook implemented in a way that detects the passed CLI opts and tries to force it by appending to args here,

https://github.com/goodboy/tractor/pull/447/changes#r3198334549

i then have a dynamic fixture requesting fixture here which tries to do something similar on a per-test declaration basis here,

https://github.com/goodboy/tractor/pull/447/changes#r3198340745

I'm wondering if what i'm doing is expected to work or not?

Ideally we can allow users to run our test suite without having to fail-early-after-pytest invocation when they do not pass pytest --capture=sys, IOW if a certain backend is parametrized into the overall run (specifially in our case with --spawn-backend=main_thread_forkserver) then we want to automatically apply as though pytest --capture=sys --spawn-backend=<backend> as well?

Please lmk what info is necessary to dig into this.
Also obviously yell at me about updating the pytest version (which we're already getting nudged about).