malkhut(assets)+uv: system-wide asset directory + UV universe init
MALKHUT asset directory (malkhut/assets/): normalized canonical symbols,
KNOWN_EXCHANGES aux table (BINANCE/BINGX/BINGX_VST), per-exchange listing
status (TRADING/OFFLINE/UNKNOWN), JSON-backed, built for full-Binance-500
scale. Seeded with BLUE's NG7 feed universe (50 symbols) + live VST
contracts probe: 35 TRADING / 15 OFFLINE on VST (BAND, CELR, COS, CVC,
DENT, FUN, HOT, ICX, TFUEL, TUSD, USDC, WAN, WIN, XTZ, ZIL).
uv_asset_universe.init_asset_universe() = runtime tradable set for the
execution exchange; --onboard runs MALKHUT AssetCompiler for full taxonomy.
12 new tests, mutation-RED verified (status-filter + tradability guard).
a062507656