Add GitHub Actions PR checks workflow

.github/workflows/pr-checks.yml

@@ -0,0 +1,52 @@
+name: PR Checks
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+permissions:
+  contents: read
+
+env:
+  PYTHON_VERSION: "3.14"
+
+jobs:
+  check-linting:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          cache: pip
+
+      - name: Install Ruff
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff
+
+      - name: Ruff
+        run: ruff check main.py core utils
+
+  check-types:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          cache: pip
+
+      - name: Install Black
+        run: |
+          python -m pip install --upgrade pip
+          pip install black
+
+      - name: Black
+        run: black --check main.py core utils