ci: skip already-published versions when publishing to PyPI

[dreamiurg]

Who's affected

Maintainers cutting releases — the release workflow's publish job currently goes red when PyPI already has the version being published.

What changed

The v1.10.0 release succeeded (tag, GitHub release, and PyPI artifacts all published), but the publish job reported failure with 400 File already exists because pypa/gh-action-pypi-publish ran for an already-published version (a double-trigger across consecutive merges). Adding skip-existing: true makes the upload idempotent: if the version is already on PyPI, it skips instead of failing the release.

Agent context

• Contracts changed: none. Workflow-only.
• Scope boundary: only .github/workflows/release.yml publish step; no code, no release-please config changes.
• Rollback risk: safe to revert (single additive flag).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 70d836aa-3c29-49f3-bec3-175d8605a88c

📥 Commits

Reviewing files that changed from the base of the PR and between c54efcf and a4f4710.

📒 Files selected for processing (1)

• .github/workflows/release.yml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.43%. Comparing base (c54efcf) to head (a4f4710).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   93.43%   93.43%           
=======================================
  Files          10       10           
  Lines        1857     1857           
  Branches      239      239           
=======================================
  Hits         1735     1735           
  Misses         84       84           
  Partials       38       38           

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