chore(repo): restore stripTextAfterTodo (removed in PR #8637)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: manovotny

.typedoc/comment-utils.mjs

@@ -22,6 +22,22 @@ function commentContainsTodo(comment) {
   return chunks.some(text => TODO_WORD.test(text));
 }
 
+/**
+ * Truncate at the first word "TODO" (case-insensitive). Used when flattening display parts to a string.
+ *
+ * @param {string} text
+ */
+export function stripTextAfterTodo(text) {
+  if (!text) {
+    return '';
+  }
+  const m = TODO_WORD.exec(text);
+  if (!m) {
+    return text;
+  }
+  return text.slice(0, m.index).trimEnd();
+}
+
 /**
  * Drop display parts from the first `TODO` onward; truncate the containing text part if `TODO` appears mid-string.
  *