- Add comprehensive database-architect agent for data layer design
- Technology selection (SQL/NoSQL/TimeSeries/NewSQL)
- Schema design and data modeling
- Migration planning and strategy
- Indexing, caching, and scalability patterns
- Handles both greenfield and re-architecture
- Works BEFORE backend-architect in workflow
- Enhance backend-architect agent with modern patterns
- Expand from 31 to 283 lines with comprehensive capabilities
- Add GraphQL, gRPC, WebSockets, event-driven architectures
- Include resilience patterns, observability, and security
- Add testing strategies and deployment patterns
- Defer database design to database-architect
- Works AFTER database-architect in workflow
Closes#70
