Trigger PyPI publish on tag push, bump to v2.0.9

- Change workflow trigger from release:published to push:tags:['v*']
- Add CLAUDE.md with release process documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

v2.0.8

• Migrate to ruff linter
• Remove TestPyPI from publish workflow

v2.0.7

Forked from the original avionmqtt repository