Add safe historical configuration explanations

compose.go

@@ -6,12 +6,13 @@ import "gitea.maximumdirect.net/eric/ConfigKit/internal/document"
 // precedence layers. Claims remain ordered by source and declaration traversal;
 // origins retain every source that contributes to a composite mapping.
 type composedDocument struct {
-	root       *document.Node
-	claims     []compositionClaim
-	origins    map[string]Origin
-	overlays   []overlayRecord
-	inputBytes int64
-	inputNodes int
+	root         *document.Node
+	claims       []compositionClaim
+	origins      map[string]Origin
+	overlays     []overlayRecord
+	applications []historyApplication
+	inputBytes   int64
+	inputNodes   int
 }
 
 type compositionClaim struct {
@@ -58,10 +59,15 @@ func composeDocuments(inputs ...*document.Node) (*composedDocument, []Diagnostic
 	for _, input := range inputs[1:] {
 		mergeDisjointMappings(root, input)
 	}
+	applications := make([]historyApplication, 0, len(inputs))
+	for _, input := range inputs {
+		applications = append(applications, historyApplication{layer: LayerBase, value: input})
+	}
 	return &composedDocument{
-		root:    root,
-		claims:  cloneCompositionClaims(collected.ordered),
-		origins: compositionOrigins(collected.ordered),
+		root:         root,
+		claims:       cloneCompositionClaims(collected.ordered),
+		origins:      compositionOrigins(collected.ordered),
+		applications: applications,
 	}, nil
 }