Use PYPI_API_KEY secret for PyPI publish workflow

Trusted publishing config wasn't matching — fall back to API token.

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

Author: chrislyonsKY

.github/workflows/publish.yml

@@ -15,3 +15,5 @@ jobs:
       - run: pip install build
       - run: python -m build
       - uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_API_KEY }}