docs(exec): design spec — live crypto execution layer (Binance USDM perps, ccxt)
Research-grounded (rate limits 2400wt/1200ord per min + 418 ban risk, clientOrderId idempotency, LOT/PRICE/
MIN_NOTIONAL filters, maker-first+POV slicing saves 50-90bps, ccxt testnet). Hexagonal: crypto_exchange port +
binance_ccxt adapter w/ rate-limit governor, pure smart_router (maker->IOC, slicing, slippage abort), full
risk layer (gross/per-symbol/leverage caps + edge-decay×Kelly scaler + kill-switch + drawdown CB), reconcile +
TCA, testnet-first w/ allow_live gate. 5 milestones.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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