OAKLAND, Calif. — Six tech billionaires walk into a courthouse … It’s not the setup to a joke. It’s the extraordinary spectacle that played out at a federal court complex over three weeks, as a mass concentration of tech wealth was put on display in a lawsuit brought by the wealthiest tech baron of them all, Elon Musk. The case has now gone to a jury of nine people who are set to begin deliberations Monday morning, but the trial has already illuminated the ways that the federal courts in the