Add all documentation subdirectories to the curated markdown linting targets, replacing the previous exclusion-based approach with comprehensive coverage. Update validation to check for required README files across all hubs and verify priority documentation metadata markers. Implement lazy loading for optional dependencies (numpy, redis, bcrypt, jwt, websockets) in agent-coordinator and related modules to improve startup
- Add infrastructure.md and workflow files to .gitignore to prevent sensitive info leaks
- Change blockchain node mempool backend default from memory to database for persistence
- Refactor blockchain node logger with StructuredLogFormatter and AuditLogger (consistent with coordinator)
- Add structured logging fields: service, module, function, line number
- Unify coordinator config with Database
