Add complete Ouroboros trading system with TDD test suite

Implement the full autonomous trading agent architecture:
- KIS broker with async API, token refresh, leaky bucket rate limiter, and hash key signing
- Gemini-powered decision engine with JSON parsing and confidence threshold enforcement
- Risk manager with circuit breaker (-3% P&L) and fat finger protection (30% cap)
- Evolution engine for self-improving strategy generation via failure analysis
- 35 passing tests written TDD-first covering risk, broker, and brain modules
- CI/CD pipeline, Docker multi-stage build, and AI agent context docs

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

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+FROM python:3.11-slim AS base
+
+WORKDIR /app
+
+# System deps
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+COPY pyproject.toml .
+RUN pip install --no-cache-dir ".[dev]"
+
+# Copy source
+COPY src/ src/
+COPY tests/ tests/
+COPY docs/ docs/
+
+# Create data directory
+RUN mkdir -p data
+
+# Run tests as build validation
+RUN pytest -v --tb=short
+
+# Production stage
+FROM python:3.11-slim AS production
+
+WORKDIR /app
+
+COPY pyproject.toml .
+RUN pip install --no-cache-dir .
+
+COPY src/ src/
+RUN mkdir -p data
+
+# Non-root user
+RUN useradd --create-home appuser
+USER appuser
+
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
+    CMD python -c "import sys; sys.exit(0)"
+
+ENTRYPOINT ["python", "-m", "src.main"]
+CMD ["--mode=paper"]