Refactor child setup to support multiple parents consistently

src/helper/childRegistrationUtils.js

@@ -11,11 +11,11 @@ class ChildRegistrationUtils {
 
     this.logger.debug(`Registering child: ${name} (${id}) as ${softwareType} at ${positionVsParent}`);
 
-    // Enhanced child setup - optional multiple parents
+    // Enhanced child setup - multiple parents
     if (Array.isArray(child.parent)) {
       child.parent.push(this.mainClass);
     } else {
-      child.parent = this.mainClass;
+      child.parent = [this.mainClass];
     }
     child.positionVsParent = positionVsParent;