Publish pavo-bench to PyPI

[vnmoorthy]

Right now pip install pavo-bench fails — only pip install git+https://github.com/vnmoorthy/pavo-bench.git works. PyPI publication makes the package one keyword search away on pypi.org and significantly lowers the barrier for adoption.

Sub-tasks

• Reserve the pavo-bench name on PyPI
• Add a GitHub Actions release workflow that builds + uploads on tag push (use pypa/gh-action-pypi-publish)
• Set up the PyPI trusted publisher for the repo (no token needed in secrets)
• Verify pip install pavo-bench and pip install pavo-bench[full] both work
• Update README quickstart to use the simpler install line

Why this matters

Most ML-systems researchers reach for pip install <name> as their first action. Half of them give up if the package isn't on PyPI. Bringing pavo-bench to PyPI is straightforward and high-leverage for adoption.

Happy to mentor on the PyPI release workflow if anyone wants to pick this up.