So you've climbed Masada? In July? Midday under the blazing sun? Good for you. We did it, too, after previous years of surviving the more prudent, pre-dawn thing. What's still missing from OC's complete Masada experience is taking in one of The Israeli Opera's annual productions under the shadow of the big rock. This year was Carmen, which premiered last night with conductor Daniel Oren leading an orchestra as an Autobots/Decepticons transformer beast of like five different choruses.