feat(live): esecuzione REALE su Deribit testnet (shadow) per i 6 fade sui lineari USDC

- ExecutionClient: notional->amount (lineare USDC + inverse), open/close_amount
  reduce-only, verifica sul trade (order_id), fee reali lette dai trades[]
- CerberoClient: place_order market + reduce_only, get_trade_history
- StrategyWorker: shadow (REAL_OPEN/REAL_CLOSE accanto al sim), ledger reale
  parallelo persistito, confronto slippage/fee sim-vs-reale
- runner+portfolios.yml: config execution (6 fade MR01/MR02/MR07 x BTC/ETH su
  BTC_USDC/ETH_USDC-PERPETUAL), capitale 2000
- smoke: live_exec_smoke (layer) + live_shadow_smoke (catena worker), provati su testnet

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

portfolios.yml

@@ -2,9 +2,19 @@
 # (definito in scripts/portfolios/_defs.py) e ne fa l'override dei parametri operativi.
 active: PORT06            # default raccomandato: master + shape
 overrides:
-  total_capital: 1000
+  total_capital: 2000
   weighting: cap          # equal | cap | inverse_vol | cluster_rp | manual
   caps: {PAIRS: 0.33}
   leverage: 2             # sobrio per il live reale
   rebalance: 1D
   poll_seconds: 60
+  # Esecuzione REALE su Deribit testnet, in SHADOW (sim + reale in parallelo).
+  # Solo i 6 fade single-leg (MR01/MR02/MR07 x BTC/ETH); ordini sui LINEARI USDC
+  # (payoff lineare = matematica del backtest; fee/PnL in USDC). Gli altri sleeve
+  # (pairs/rotation/tsmom/shape/dip) restano simulati.
+  execution:
+    enabled: true
+    sleeves: [MR01, MR02, MR07]
+    instruments:
+      BTC: BTC_USDC-PERPETUAL
+      ETH: ETH_USDC-PERPETUAL