Preserve sibling inheritance in configuration history and explanations

internal/engine/metadata.go

@@ -13,6 +13,7 @@ type Metadata struct {
 	historicalPaths map[string][]Path
 	fields          map[string]FieldInfo
 	history         map[string][]Change
+	inheritance     []inheritanceOperation
 }
 
 // Lookup returns information for an effective path. Unknown and invalid paths
@@ -25,7 +26,9 @@ func (m Metadata) Lookup(path Path) (FieldInfo, bool) {
 	if !ok {
 		return FieldInfo{}, false
 	}
-	return cloneFieldInfo(info), true
+	detached := cloneFieldInfo(info)
+	detached.Origin.Inheritance = projectInheritanceSteps(detached.Origin)
+	return detached, true
 }
 
 // IsExplicit reports whether a surviving input contribution explicitly defined
@@ -43,15 +46,8 @@ func (m Metadata) History(path Path) []Change {
 	if !m.hasHistoricalPath(path) {
 		return nil
 	}
-	history, ok := m.history[path.String()]
-	if !ok {
-		return nil
-	}
-	cloned := make([]Change, len(history))
-	for i, change := range history {
-		cloned[i] = cloneChange(change)
-	}
-	return cloned
+	history := m.history[path.String()]
+	return historyWithInheritance(path, history, m.inheritance)
 }
 
 // HistoricalPaths returns the paths observed during loading, including effective
@@ -136,6 +132,16 @@ func finalizeMetadataPaths(m *Metadata, final *document.Node, applications []his
 		}
 		walkDocument(application.value, prefix, add)
 	}
+	for _, operation := range m.inheritance {
+		if operation.control != nil {
+			add(operation.control.path, nil)
+			continue
+		}
+		if operation.transfer != nil {
+			walkDocument(operation.parent, operation.transfer.to, add)
+			walkDocument(operation.effective, operation.transfer.to, add)
+		}
+	}
 }
 
 // effectivePathIndex records document-derived paths with their contextual segment