Exercise document-root controls through the public API

facade_diagnostic_order_test.go

@@ -12,7 +12,7 @@ import (
 
 func TestFacadeCompositionConflictKeepsClaimantOrder(t *testing.T) {
 	filesystem := configkit.NewFilesystem("bundle", fstest.MapFS{
-		"a.yml": &fstest.MapFile{Data: []byte(`configkit:
+		"a.yml": &fstest.MapFile{Data: []byte(`config:
   imports:
     - path: z.yml
 `)},
@@ -21,7 +21,7 @@ func TestFacadeCompositionConflictKeepsClaimantOrder(t *testing.T) {
 		"z.yml": &fstest.MapFile{Data: []byte("x: z\n")},
 	})
 	main := configkit.Mapping("main", map[string]any{
-		"configkit": map[string]any{"imports": []any{
+		"config": map[string]any{"imports": []any{
 			map[string]any{"path": "a.yml"},
 			map[string]any{"path": "b.yml"},
 			map[string]any{"path": "c.yml"},