San Francisco was written off as tech workers were laid off and remote work became the norm. Then came the robots — and with them, a real estate revival nobody saw coming. Since OpenAI unleashed GPT-3.5 on the world in November 2022, home prices in the Bay Area’s wealthiest ZIP codes have rocketed 13.4%, more than twice the gains posted by the next tier down, according to a Redfin analysis.   The city that skeptics were eulogizing is suddenly one of the hottest luxury property markets in the country. Since OpenAI launched its breakout AI tool in late 2022, luxury home prices in the Bay Area have jumped 13%, more than double the gains seen in mid-tier neighborhoods, while the cheapest ZIP codes actually lost value. Nicholas J.…