WASHINGTON, April 14 : Holdings in Elon Musk's SpaceX company and predictions platform Polymarket are among dozens of future-oriented assets that Federal Reserve chair nominee Kevin Warsh lists on a newly filed financial disclosure that shows dozens of apparently small bets on a wide array of emerging and almost science fiction-sounding ventures. Warsh's major holdings put his assets at well over $100 million, including two $50-million-plus holdings in the Juggernaut Fund LP, apparently part of