setup.py was deleted in #70 but the release workflow still runs `uv run
--frozen python setup.py sdist`, so the next release would fail at the
build step. The v2.10.2 release already failed to publish (its workflow
run predates #70 and died in the old pipenv setup), which is why PyPI is
still at 2.10.1. `uv build` produces the sdist and wheel from
pyproject.toml directly, and `gh-action-pypi-publish` picks them up from
`dist/` as before.

Tested by running `uv build` in this branch: both artifacts build, and
the wheel's `lightspark_client.py` compiles with no SyntaxWarning (the
E614_REGEX escape fix from #47 is included, which 2.10.1 on PyPI
predates).