(Bloomberg) -- The braintrust that turned OpenAI into the world’s best-known artificial intelligence startup huddled at Sam Altman’s home in San Francisco on Tuesday for another day of fighting with the company’s board to reinstate him as the chief executive officer in what had already become one of the most dramatic corporate power struggles in Silicon Valley history.“Still working on it…,” Mira Murati, OpenAI’s chief technology officer and very briefly its interim CEO, wrote in a Slack message