Implement promiseRace(promises) function that works like native Promise.race().

Requirements:

• Takes an array of promises
• Resolves/rejects with the result of the first settled promise
• Other promises are ignored (but continue executing)
• Empty array should return a promise that never resolves
• Must handle both fulfilled and rejected promises
• DO NOT use built-in Promise.race()

Example:

const result = await promiseRace([
  new Promise(res => setTimeout(() => res('slow'), 100)),
  new Promise(res => setTimeout(() => res('fast'), 50))
]);
// result = 'fast' (first to complete)