ci: add PyPI publish workflow

[pbertsch]

Adds a GitHub Actions workflow that publishes the awsysco package to PyPI automatically when a v* tag is pushed.

Uses OIDC Trusted Publishing — no PYPI_API_TOKEN secret needed in GitHub. Instead, configure Trusted Publishing on PyPI:

1. Go to https://pypi.org → Your account → Publishing → Add a new pending publisher
2. PyPI project name: awsysco
3. Owner: AlphaWaveSystems
4. Repository: awsysco-python-sdk
5. Workflow filename: publish.yml
6. Environment name: pypi

Then create and push a v0.1.0 tag to trigger the first publish:

git tag v0.1.0
git push origin v0.1.0

Test plan

• PyPI Trusted Publishing configured for awsysco package
• Merge this PR
• Tag v0.1.0 triggers workflow and publishes successfully
• pip install awsysco returns package