[Bug]: Cannot run nox without noxfile.py

[CakeCrusher]

What happened?

Trying to make PRs where the template suggests I should run nox -s format.
In order to run that command the repo needs nox -s format which does not exist.

In short this seems to follow a similar through line with #355 where there are several CI expectations some of which conflict with each other and other (like this one) that are half developed.

I think stripping things down or polishing this process would be worthwhile.

Relevant log output

(A2A) sebas@sebas-HP-Dragonfly-13-5-inch-G4-Notebook-PC:~/Forks/A2A$ nox -s format
Traceback (most recent call last):
  File "/home/sebas/Forks/A2A/.venv/bin/nox", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/sebas/Forks/A2A/.venv/lib/python3.12/site-packages/nox/_cli.py", line 169, in main
    toml_config = load_toml(os.path.expandvars(args.noxfile), missing_ok=True)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sebas/Forks/A2A/.venv/lib/python3.12/site-packages/nox/project.py", line 63, in load_toml
    return _load_script_block(filepath, missing_ok=missing_ok)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sebas/Forks/A2A/.venv/lib/python3.12/site-packages/nox/project.py", line 75, in _load_script_block
    script = filepath.read_text(encoding="utf-8")
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/pathlib.py", line 1029, in read_text
    with self.open(mode='r', encoding=encoding, errors=errors) as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/pathlib.py", line 1015, in open
    return io.open(self, mode, buffering, encoding, errors, newline)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'noxfile.py'
(A2A) sebas@sebas-HP-Dragonfly-13-5-inch-G4-Notebook-PC:~/Forks/A2A$

Code of Conduct

• I agree to follow this project's Code of Conduct