- Add rate_limit.py middleware with per-client throttling and cleanup task
- Add pool_monitor.py for database connection pool health monitoring
- Add custom exceptions module (GameEngineError, DatabaseError, etc.)
- Add config settings for eviction intervals, session timeouts, memory limits
- Add unit tests for rate limiting and pool monitoring
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
