/** Strip markdown artifacts and normalize whitespace. Pure, no side effects. */
export function cleanText(str) {
  if (!str) return "";
  return str
    .replace(/^#+\s*/gm, "")
    .replace(/\*\*(.*?)\*\*/g, "$1")
    .replace(/[*_`]/g, "")
    .replace(/\s+/g, " ")
    .trim();
}