Palantir's business is extraordinary, but the stock now assumes near-perfect execution for years.Palantir Technologies (PLTR 1.78%), the artificial intelligence (AI) data platform specialist, recently posted a milestone quarter and raised its outlook again, helping drive a monster run in the shares this year.The company's tools sit at the heart of high-stakes decisions for governments and enterprises, and demand has accelerated in recent quarters. But the stock has raced far ahead of even strong fundamental ...