- Test ErrorType enum (NETWORK, VALIDATION, SYSTEM, AUTH)
- Test KBError base class with to_dict method
- Test NetworkError with status_code and auto-suggestion
- Test ValidationError with validation_errors list
- Test SystemError with system_message
- Test AuthError with auth_type
- Test error class hierarchy
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
