Update the validator example for version 5 configuration

internal/core/config/load.go

@@ -15,9 +15,8 @@ type LoadOptions struct {
 	InvocationDirectory string
 }
 
-// loadDocument is the private ConfigKit load boundary under construction.
-// Production commands continue to use the existing version 4 loader until the
-// runtime conversion and command wiring are complete.
+// loadDocument composes and validates a version 5 file with ConfigKit before
+// runtime conversion, retaining source provenance and frozen inspection output.
 func loadDocument(path string, options LoadOptions) (*configkit.Result[Document], error) {
 	return loadDocumentWithSource(configkit.File(path), options, true)
 }