By Paul Teetor Steve Nash survived a near-death experience this week. There will be a few scars and some long-range consequences yet unknown, but he will live to coach another season.      In the process the long-time Manhattan Beach resident learned the most important lesson for an employee in a high-stress workplace: when a big shot with leverage on your company tries to get you fired, the key to survival is having a boss who has your back no matter what.…