"""Phase 4: Final Polish - Integration Tests (400+ tests).

Work Packages:
- WP-4.1: Integration Tests (200+) - Cross-layer workflows, E2E scenarios
- WP-4.2: Error Paths (100+) - All error conditions, boundary cases
- WP-4.3: Concurrency (50+) - Race conditions, stress testing
- WP-4.4: Chaos Mode (50+) - Failure injection, recovery logic
"""

__all__ = []
