Enable explicit configuration imports and overlays

internal/config/load.go

@@ -21,8 +21,10 @@ type LoadOptions struct {
 // Load resolves one ConfigKit document and retains its inspection snapshot.
 func Load(options LoadOptions) (*configkit.Result[Document], error) {
 	var source configkit.Source
+	fileBacked := false
 	if options.Explicit {
 		source = configkit.File(options.Path)
+		fileBacked = true
 	} else {
 		selected := ""
 		for _, candidate := range defaultConfigSearchPaths {
@@ -41,11 +43,14 @@ func Load(options LoadOptions) (*configkit.Result[Document], error) {
 			source = configkit.NoSource()
 		} else {
 			source = configkit.File(selected)
+			fileBacked = true
 		}
 	}
 
 	result, err := configkit.Load(source, configkit.Options[Document]{
 		Definition: documentDefinition(),
+		Imports:    fileBacked,
+		Overlay:    options.Overlay,
 		Overrides:  options.Overrides,
 	})
 	if err != nil {