ci: add GitHub Actions workflows

- CI: lint, type check, build on push/PR to main
- Deploy/publish on tag push (vX.Y.Z)
- Version verification (tag must match package version)

Author: Delega Bot

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[async]"
+          pip install pytest
+
+      - name: Run tests
+        run: pytest tests/ -v

.github/workflows/publish.yml

@@ -0,0 +1,40 @@
+name: Publish to PyPI
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install build tools
+        run: pip install build
+
+      - name: Verify version matches tag
+        run: |
+          PKG_VERSION=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project']['version'])")
+          TAG_VERSION="${GITHUB_REF_NAME#v}"
+          if [ "$PKG_VERSION" != "$TAG_VERSION" ]; then
+            echo "❌ pyproject.toml version ($PKG_VERSION) doesn't match tag ($TAG_VERSION)"
+            exit 1
+          fi
+
+      - name: Build package
+        run: python -m build
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          attestations: true