WASHINGTON — It’s the richest table ever assembled. An extraordinary cadre of the country’s most powerful tech titans with a collective fortune of over $1.8 trillion converged upon the White House Tuesday for President Trump’s summit on artificial intelligence. Despite many of them competing against each other — in some cases very bitterly — the multi-billionaire president managed to bring them together at the White House to discuss how America and outflank China — and the guardrails needed for the nascent tech. The summit illustrated Trump’s eagerness to have the federal government collaborate with and elevate the private sector, despite...