Publish PyPI wheels and verify wheel installs in CI

[FatahChan]

Closes packaging gap from issue #2.

Summary

• Wheels workflow: Build wheels with cibuildwheel (Linux, Windows, macOS Intel + ARM), keep publishing the sdist, merge artifacts, and upload to PyPI on GitHub Release publish.
• Pre-publish gate: New \�erify_wheel_install\ job runs a manylinux wheel build plus pytest in a clean venv; \upload_pypi\ depends on it so a broken wheel layout cannot ship.
• CI on PRs: Wheel verification runs on every pull request (not only PRs targeting \main), via \scripts/verify_wheel_install.sh.
• Tests: \ ests/test_wheel_package.py\ asserts the extension loads as a native module and exercises the public API.

Notes

• PyPI token and GitHub \pypi\ environment unchanged; first release after merge should show .whl\ files alongside the sdist on PyPI.

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