Add safe historical configuration explanations

override.go

@@ -378,7 +378,8 @@ func cloneComposedDocument(base *composedDocument) *composedDocument {
 	return &composedDocument{
 		root: document.Clone(base.root), claims: cloneCompositionClaims(base.claims),
 		origins: cloneOriginIndex(base.origins), overlays: cloneOverlayRecords(base.overlays),
-		inputBytes: base.inputBytes, inputNodes: base.inputNodes,
+		applications: cloneHistoryApplications(base.applications),
+		inputBytes:   base.inputBytes, inputNodes: base.inputNodes,
 	}
 }
 
@@ -428,6 +429,10 @@ func applyPreparedOverride(result *composedDocument, override preparedOverride)
 		result.overlays = append(result.overlays, overlayRecord{change: Change{
 			Path: path.clone(), Origin: overlayOrigin(LayerCLI, location), Previous: previousOrigins(previous),
 		}, displaced: displaced, before: before, after: document.Clone(current.Mapping[position].Value)})
+		result.applications = append(result.applications, historyApplication{
+			layer: LayerCLI, path: path.clone(), value: override.value,
+			origin: overlayOrigin(LayerCLI, location),
+		})
 	}
 }