The Trump administration plans to send a special energy envoy to Saudi Arabia to work with the kingdom on stabilizing the global oil market, officials said on Friday, as the U.S. scrambles to deal with a price crash so deep that regulators in Texas considered curbing production there for the first time in nearly 50 years.Oil prices have lost more than half their value in the last two weeks as Saudi Arabia and Russia kicked off a price war and the coronavirus pandemic destroyed demand…