Add GitHub Actions workflow for automated pytest execution

- Created .github/workflows/tests.yml
- Configured to run pytest on Python 3.8-3.11
- Triggers on push/PR to master branch
- Installs dependencies and runs tests in tests/ directory
- Does not include linters per user request

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jeremymanning

.github/workflows/tests.yml

@@ -0,0 +1,33 @@
+name: Tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, '3.10', '3.11']
+
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest
+        pip install -r requirements.txt
+        pip install -e .
+    
+    - name: Run tests with pytest
+      run: |
+        pytest tests/ -v