fix: keep the tests package out of the installed distribution

[blaipr]

Summary

find_packages is told to exclude test and test.*, the layout the client had while it lived in the Ascender repository. The tests are in tests here, so the exclusion matches nothing and every test package is collected into the distribution.

The published 25.5.1 wheel shows it:

$ python -m zipfile -l ascender_kit-25.5.1-py3-none-any.whl
  entries under tests/: 27
  top_level.txt: 'ascenderkit\ntests\n'

So pip install ascender-kit creates site-packages/tests/, which shadows any other top-level tests package on the path and collides file-for-file with any other distribution that ships one.

After the change, rebuilding from the same tree:

	wheel entries under tests/	top_level.txt	sdist test files
Before	27	ascenderkit, tests	32
After	0	ascenderkit	32

The source distribution takes its contents from MANIFEST.in, which includes recursive-include tests *.py *.yml *.md explicitly, so the tests stay where they are useful and only the installed package changes.

Nothing in CI would catch a recurrence today. The build job installs the wheel and runs ascender --help, which passes either way. Happy to add a step asserting the wheel contains nothing outside ascenderkit/ and *.dist-info/ if you want the guard.

Type of Change

• Bug fix
• New feature or enhancement
• Breaking change
• Documentation / tooling

Component

Packaging (setup.py).

Checklist

• Tests pass (pytest tests/unit): 351 passed
• Linting passes (black --check ascenderkit tests setup.py, flake8 ascenderkit)
• Changelog entry added under Unreleased
• Documentation updated (if applicable): none describes the package layout