/**
 * Normalize a public Hugging Face reference before it becomes an inert
 * Lumbridge model-suggestion record.
 */
export function parseHuggingFaceRef(input: string): string | null {
  const trimmed = input.trim().replace(/\/+$/, "");
  const url = trimmed
    .replace(/^https?:\/\/(www\.)?huggingface\.co\//i, "")
    .replace(/^hf:\/\//i, "");
  // owner/model — letters, digits, dot, dash, underscore.
  return /^[\w.-]+\/[\w.-]+$/.test(url) ? url : null;
}