Add multi-agent config and registry runtime flow

pkg/agent/context.go

@@ -88,6 +88,7 @@ func (cb *ContextBuilder) buildToolsSection() string {
 		sb.WriteString(s)
 		sb.WriteString("\n")
 	}
+	sb.WriteString("\nWhen creating a new subagent or changing config.json agent definitions, draft first and wait for explicit user confirmation before persisting changes.\n")
 
 	return sb.String()
 }