Make PyPI publish job idempotent on reruns by skipping existing distributions

[Copilot]

The Publish to PyPI Actions job failed because reruns attempted to upload distribution filenames that were already published, and PyPI rejects file-name reuse (400 File already exists). This PR updates the release workflow so publish can safely proceed when artifacts already exist.

• Workflow: PyPI publish behavior

  • Updated .github/workflows/release.yaml in the publish job to enable existing-file tolerance in pypa/gh-action-pypi-publish.

• Failure mode addressed

  • Handles rerun/retry scenarios where the same wheel/sdist has already been uploaded for the same version.

- name: Publish to PyPI
  uses: pypa/gh-action-pypi-publish@...
  with:
    packages-dir: dist/
    verbose: true
    skip-existing: true

[Copilot]

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