Add CI workflow (#8)

* add ci workflow

* fixup

Author: kevinddchen

.github/workflows/check.yml

@@ -0,0 +1,40 @@
+name: Python Checks
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  lint-and-typecheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/0.9.7/install.sh | sh
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Install dependencies
+        run: |
+          uv sync
+
+      - name: Run Ruff (lint + format check)
+        run: |
+          uv run ruff check .
+          uv run ruff format --check .
+
+      - name: Run Mypy (type check)
+        run: |
+          uv run mypy .