Build the walk root in New, drop the categories copy, and correct the node and renders comments

record.go

@@ -126,7 +126,7 @@ func (f *Generator) FakeRecord(path string) (*Record, error) {
 	if err != nil {
 		return nil, fmt.Errorf("fejkdata: %w", err)
 	}
-	_, n, tail, err := resolveCategory(f.categories, segments)
+	_, n, tail, err := resolveCategory(f.root.children, segments)
 	if err != nil {
 		return nil, fmt.Errorf("fejkdata: %s: %w", path, err)
 	}