Load a shipped category on the first call reaching it, from an index generated from data/

render.go

@@ -24,6 +24,9 @@ func (f *Generator) Fake(path string) (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("fejkdata: %w", err)
 	}
+	if err := f.loadShippedAt(segments); err != nil {
+		return "", fmt.Errorf("fejkdata: %w", err)
+	}
 	var draws renderDraws
 	sc := renderScope{draws: &draws}
 	n, err := descend(f.rand, &f.root, segments, sc)