Go Development Skill

# Go Development Skill Production-grade Go development patterns for building resilient services, extracted from real-world projects including job schedulers, Docker integrations, and LDAP clients. ## Features - **Architecture Patterns**: Package structure best practices, job abstraction hierarchy, configuration management (5-layer precedence), middleware chain pattern - **Resilience Patterns**: Retry logic with exponential backoff, graceful shutdown, context propagation, error handling strategies - **Docker Integration**: Optimized Docker client patterns, buffer pooling for performance, container execution patterns - **LDAP Integration**: Active Directory patterns, user and group management, authentication flows - **Testing Strategy**: Test pyramid (unit/integration/e2e), build tags for test isolation, table-driven tests, comprehensive coverage - **Performance Optimization**: Buffer pooling, connection reuse, lazy initialization, context deadlines - **Observability**: Prometheus met