ci: add GitHub Actions for checks and PyPI release

PDM-based CI on 3.14 (ruff, basedpyright, pytest); tag publish without git-cliff.

.github/workflows/python-publish.yml

@@ -0,0 +1,39 @@
+name: Release and Publish Python Package
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+  id-token: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+
+      - name: Install build
+        run: python -m pip install --upgrade pip build
+
+      - name: Build package
+        run: python -m build --sdist --wheel --outdir dist/ .
+
+      - name: Publish package
+        uses: pypa/gh-action-pypi-publish@release/v1
+
+      - name: Create GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            dist/*
+          generate_release_notes: true