feat: load explicit configuration references and remove implicit env overlays

config/diagnostic.go

@@ -82,8 +82,9 @@ type Position struct{ Line, Column int }
 // string, bool, json.Number, nil, []any, map[string]any. Text is available for
 // formats such as XML whose scalar tokens have no inherent JSON type.
 type Document struct {
-	Value     any
-	Positions map[string]Position
+	Value        any
+	Positions    map[string]Position
+	environments map[string][]string
 }
 
 type Text string