ci: add PyPI trusted publisher workflow

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish to PyPI
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build-and-publish:
+    name: Build and publish to PyPI
+    runs-on: ubuntu-latest
+    environment: release
+    permissions:
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - run: pip install build
+
+      - run: python -m build
+
+      - uses: pypa/gh-action-pypi-publish@release/v1