async function inspectPersianVoices(waitMs = 2000) {
  if (!("speechSynthesis" in window)) return {apiAvailable:false, voices:[]};
  if (!Number.isInteger(waitMs) || waitMs < 0 || waitMs > 5000) throw new Error("waitMs 0..5000");
  const synth = window.speechSynthesis;
  const snapshot = () => synth.getVoices().map(v => ({name:v.name, lang:v.lang, localService:v.localService, default:v.default}));
  const hasFa = rows => rows.some(v => /^fa(?:-|$)/i.test(v.lang));
  const initial = snapshot();
  if (hasFa(initial)) return {apiAvailable:true, reason:"persian_reported", voices:initial};
  return await new Promise(resolve => {
    let timer;
    const finish = reason => {clearTimeout(timer); synth.removeEventListener("voiceschanged", changed); resolve({apiAvailable:true,reason,voices:snapshot()});};
    const changed = () => {if (hasFa(snapshot())) finish("persian_reported_after_change");};
    synth.addEventListener("voiceschanged", changed);
    timer = setTimeout(() => finish("bounded_check_finished"), waitMs);
    changed();
  });
}
// In your browser console: inspectPersianVoices().then(console.log)
// This function never calls speak(), asks for a microphone, or uploads text.