fix: correct loop condition in comment parsing

The loop was checking 'for i.Done()' instead of 'for !i.Done()',
which prevented the comment content from being consumed.
This caused the tokenizer to treat comment text as code.

pkg/saccharine/token/parse.go

@@ -79,7 +79,7 @@ func getToken(i *iterator.Iterator[rune]) (*Token, error) {
 		return NewHardBreak(index), nil
 	case letter == '#':
 		// Skip everything until the next newline or EOF.
-		for i.Done() {
+		for !i.Done() {
 			r, err := i.Next()
 			if err != nil {
 				return nil, trace.Wrap(err, "error while parsing comment")