ci: add GitHub Actions workflow for automated code quality checks

- Create CI pipeline testing Python 3.8-3.12 compatibility
- Add automated Black, isort, Flake8, and MyPy checks
- Include import structure validation for all modules
- Set up continuous integration for pull requests and pushes
- Enable early detection of code quality issues

Author: Neverdecel

.github/workflows/code-quality.yml

@@ -0,0 +1,51 @@
+name: Code Quality
+
+on:
+  push:
+    branches: [ main, master, develop ]
+  pull_request:
+    branches: [ main, master, develop ]
+
+jobs:
+  code-quality:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, '3.10', '3.11', '3.12']
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - 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 black flake8 mypy isort
+        pip install -r requirements.txt
+    
+    - name: Run Black (Code Formatting)
+      run: black --check --diff .
+    
+    - name: Run isort (Import Sorting)
+      run: isort --check-only --diff .
+    
+    - name: Run Flake8 (Linting)
+      run: flake8 . --max-line-length=88 --ignore=E203,W503 --exclude=.venv,venv,__pycache__,.git
+    
+    - name: Run MyPy (Type Checking)
+      run: mypy . --ignore-missing-imports --no-strict-optional
+      continue-on-error: true  # Allow MyPy to fail without stopping the workflow
+    
+    - name: Test Import Structure
+      run: |
+        python -c "import coderag.config; print('✓ Config import successful')"
+        python -c "import coderag.embeddings; print('✓ Embeddings import successful')"
+        python -c "import coderag.index; print('✓ Index import successful')"
+        python -c "import coderag.search; print('✓ Search import successful')"
+        python -c "import coderag.monitor; print('✓ Monitor import successful')"
+      env:
+        OPENAI_API_KEY: dummy-key-for-testing