feat: Add GitHub infrastructure, CI/CD pipelines, and examples

- Add GitHub issue templates (bug, feature, docs)
- Add pull request template with closed-source checklist
- Add CODEOWNERS for code review assignment
- Add CI/CD workflows (ci, lint, security, docs, release)
  - pytest + coverage with Python 3.10/3.11 matrix
  - Ruff + MyPy code quality checks
  - Bandit + safety security scanning
  - Sphinx docs + GitHub Pages deployment
  - Automated PyPI releases on tag push
- Add 6 comprehensive examples + Jupyter quickstart
  - 01_factor_discovery.py (LLM factor generation)
  - 02_factor_evolution.py (factor optimization)
  - 03_strategy_generation.py (IC-weighted combination)
  - 04_backtest_simple.py (strategy backtesting)
  - 05_model_training.py (XGBoost/LSTM training)
  - 06_rl_trading_agent.py (PPO/DQN/A2C agents)
  - notebooks/quickstart.ipynb (interactive tutorial)
- Restructure .gitignore with explicit closed-source sections
- Add CI/coverage/license badges to README
- Complete CLI docstrings for all 9 commands
- Add data_config.yaml for quant loop configuration

.github/workflows/release.yml

@@ -0,0 +1,97 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+      - 'V*'
+
+permissions:
+  contents: write
+  packages: write
+
+jobs:
+  release:
+    name: Create Release
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.10"
+
+    - name: Install build tools
+      run: |
+        python -m pip install --upgrade pip
+        pip install build twine
+
+    - name: Build package
+      run: python -m build
+
+    - name: Check package
+      run: twine check dist/*
+
+    - name: Verify no closed-source assets
+      run: |
+        echo "=== Verifying Release Package ==="
+
+        # Extract and check contents
+        python -c "
+        import tarfile
+        import sys
+
+        with tarfile.open('dist/' + [f for f in __import__('os').listdir('dist') if f.endswith('.tar.gz')][0], 'r:gz') as tar:
+            names = tar.getnames()
+            closed_patterns = ['git_ignore_folder', 'results/', '.env', 'models/local', 'prompts/local']
+
+            found = False
+            for name in names:
+                for pattern in closed_patterns:
+                    if pattern in name:
+                        print(f'ERROR: Found closed-source asset: {name}')
+                        found = True
+
+            if found:
+                sys.exit(1)
+            print('✓ No closed-source assets in package')
+        "
+
+    - name: Generate release notes
+      id: release_notes
+      run: |
+        # Try to find changelog for this version
+        VERSION=${GITHUB_REF#refs/tags/}
+        CHANGELOG_FILE="changelog/${VERSION}.md"
+
+        if [ -f "$CHANGELOG_FILE" ]; then
+          echo "body_path=$CHANGELOG_FILE" >> $GITHUB_OUTPUT
+        elif [ -f "CHANGELOG.md" ]; then
+          # Extract section for this version from main changelog
+          echo "body_path=CHANGELOG.md" >> $GITHUB_OUTPUT
+        else
+          echo "body_path=" >> $GITHUB_OUTPUT
+        fi
+
+    - name: Create GitHub Release
+      uses: softprops/action-gh-release@v2
+      with:
+        body_path: ${{ steps.release_notes.outputs.body_path || '' }}
+        files: dist/*
+        draft: false
+        prerelease: false
+        generate_release_notes: true
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Publish to PyPI
+      if: startsWith(github.ref, 'refs/tags/v')
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
+      run: twine upload dist/*