Add GitHub Actions release workflow for PyPI publishing

Uses OIDC trusted publishing (no API token needed). Runs the full test
matrix first, then builds and publishes on success.

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

Author: mpcabd

.github/workflows/release.yml

@@ -0,0 +1,33 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+      - run: uv python install ${{ matrix.python-version }}
+      - run: uv sync --group dev
+      - run: uv run pytest
+
+  publish:
+    needs: test
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+      - run: uv build
+      - uses: pypa/gh-action-pypi-publish@release/v1