Russian space officials are preparing the old, frail and forgetful Mir spacecraft for an assisted suicide. A top official at RKK Energia, the company that built Mir and oversees it, said that cosmonauts on board would begin to maneuver it into a lower orbit in May, the first step in letting gravity do its work. A module would be launched toward Mir on May 15 carrying fuel to propel the station toward Earth, a spokesman for the Russian space agency said.