Print the CSV header at -n 0, refuse --separator with a record format, refuse a date field in time(), read a bare number template as a format string, and say when no data is loaded

record.go

@@ -136,7 +136,7 @@ func (f *Generator) FakeRecord(path string) (*Record, error) {
 	f.loadShippedAt(segments)
 	_, n, tail, err := resolveCategory(f.root.children, segments)
 	if err != nil {
-		return nil, fmt.Errorf("fejkdata: %s: %w", path, err)
+		return nil, f.noDataNote(fmt.Errorf("fejkdata: %s: %w", path, err))
 	}
 	var frames frameStack
 	env := renderEnv{frames: &frames}