Skip PyPI publish for package releases

[rolandpg]

Summary

• restrict the PyPI publish job to release tags that start with v
• prevent package-only releases such as packages-v0.1.0 from attempting a duplicate Python package upload

Validation

• parsed all workflow YAML files
• ran git diff --check

[Copilot]

Pull request overview

This PR prevents unintended PyPI uploads by restricting the publish workflow to only run for GitHub Releases whose tag name starts with v, avoiding conflicts with “package-only” release tags like packages-v0.1.0.

Changes:

• Add a job-level if: guard to only run the PyPI publish job when github.event.release.tag_name starts with v.
• Document the rationale inline to clarify why package-only releases should skip PyPI publishing.

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