Add PyPI release workflow; prepare v0.1.0

[kmatzen]

Summary

• Adds .github/workflows/release.yml — triggered on GitHub release creation, builds wheels on Linux and macOS, publishes to PyPI via trusted publisher
• Marks CHANGELOG as v0.1.0
• Adds dist/ to .gitignore

To release after merging

1. Set up PyPI trusted publisher: go to https://pypi.org/manage/project/framewright/settings/publishing/ and add GitHub Actions as a trusted publisher (owner: kmatzen, repo: framewright, workflow: release.yml, environment: pypi)
2. Create a GitHub release with tag v0.1.0
3. The workflow builds wheels and publishes automatically

Verified locally

• python -m build --wheel produces a working wheel
• pip install dist/framewright-*.whl installs successfully
• import framewright works, reading/writing videos confirmed

Test plan

• Wheel builds locally
• Package installs and imports
• VideoReader/VideoWriter round-trip works from Python
• CI release workflow runs on tag creation

🤖 Generated with Claude Code