fix: revert to token-based PyPI publishing in release.yml

[farhan]

Purpose

This PR exists to test that python-semantic-release (PSR) still cuts a release end to end. It reverts the OIDC trusted-publishing change so PSR runs on a fix: commit and we can observe the full release flow.

Changes

Reverts 9fcc655 (fix: use OIDC trusted publishing in release.yml). Restores token-based PyPI authentication on the Publish to PyPI step:

      - name: Publish to PyPI
        uses: pypa/gh-action-pypi-publish@release/v1
        with:
          user: __token__
          password: ${{ secrets.PYPI_UPLOAD_TOKEN }}

Release note

Uses a fix: commit type so PSR triggers a release on merge.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.17%. Comparing base (87799b5) to head (a4a5057).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
=======================================
  Files          48       48           
  Lines        1419     1419           
  Branches      110      110           
=======================================
  Hits         1166     1166           
  Misses        221      221           
  Partials       32       32           

Flag	Coverage Δ
unittests	82.17% <ø> (ø)

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