ci: add ruff lint workflow and fix formatting

.github/workflows/lint.yml

@@ -0,0 +1,27 @@
+name: Lint
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: ['**']
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: astral-sh/setup-uv@v5
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+
+      - run: uv sync --group dev
+
+      - name: Check formatting
+        run: uv run ruff format --check .
+
+      - name: Check linting
+        run: uv run ruff check .