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/ci.yml

@@ -0,0 +1,84 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, develop ]
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+      - 'LICENSE'
+  pull_request:
+    branches: [ main ]
+    paths-ignore:
+      - '**.md'
+      - 'docs/**'
+      - 'LICENSE'
+
+env:
+  PYTHONUNBUFFERED: "1"
+
+jobs:
+  test:
+    name: Test (Python ${{ matrix.python-version }}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11"]
+        os: [ubuntu-latest]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Cache pip dependencies
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-py${{ matrix.python-version }}-pip-${{ hashFiles('**/requirements.txt', '**/pyproject.toml') }}
+        restore-keys: |
+          ${{ runner.os }}-py${{ matrix.python-version }}-pip-
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e ".[test]"
+        pip install -r requirements.txt
+
+    - name: List installed packages
+      run: pip list
+
+    - name: Run tests with coverage
+      run: |
+        pytest test/ \
+          -v \
+          --cov=rdagent \
+          --cov-report=xml \
+          --cov-report=html \
+          --cov-report=term-missing \
+          --durations=10 \
+          -x
+
+    - name: Upload coverage to Codecov
+      if: matrix.python-version == '3.10' && github.ref == 'refs/heads/main'
+      uses: codecov/codecov-action@v4
+      with:
+        file: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+        fail_ci_if_error: false
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
+    - name: Upload coverage HTML report
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: coverage-html-report-py${{ matrix.python-version }}
+        path: htmlcov/
+        retention-days: 7