feat(live): alert Telegram esecuzione reale + doc shadow-execution in CLAUDE.md

- telegram_notifier: eventi REAL_EXEC_LIVE (primo ordine reale verificato per worker)
  e REAL_OPEN_FAIL (apertura reale non verificata)
- StrategyWorker: notifica una-tantum al primo REAL_OPEN verificato + ogni FAIL;
  flag real_first_notified persistito
- CLAUDE.md: documentato lo shadow-execution (ExecutionClient, lineari USDC,
  verifica sul trade, fee reali, config, alert, smoke)

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

src/live/strategy_worker.py

@@ -55,6 +55,7 @@ class StrategyWorker:
         self.real_entry_notional = 0.0   # USD effettivi esposti all'entrata
         self.real_order_id = ""
         self.real_trades = 0
+        self.real_first_notified = False   # alert Telegram "esecuzione viva" una tantum
 
         self.worker_id = f"{strategy.name}__{asset}__{tf}"
         self.work_dir = data_dir / self.worker_id
@@ -116,6 +117,7 @@ class StrategyWorker:
         self.real_entry_notional = state.get("real_entry_notional", 0.0)
         self.real_order_id = state.get("real_order_id", "")
         self.real_trades = state.get("real_trades", 0)
+        self.real_first_notified = state.get("real_first_notified", False)
 
         self._log("RESUME", {"capital": round(self.capital, 2),
                               "total_trades": self.total_trades,
@@ -147,6 +149,7 @@ class StrategyWorker:
             "real_entry_notional": self.real_entry_notional,
             "real_order_id": self.real_order_id,
             "real_trades": self.real_trades,
+            "real_first_notified": self.real_first_notified,
             "last_update": datetime.now(timezone.utc).isoformat(),
         }
         with open(self.status_path, "w") as f:
@@ -228,8 +231,12 @@ class StrategyWorker:
                                         if linear else fill.amount)
             self.real_order_id = fill.order_id or ""
             self._log("REAL_OPEN", data)
+            if not self.real_first_notified:   # conferma una-tantum: l'esecuzione reale e' viva
+                self._notify("REAL_EXEC_LIVE", data)
+                self.real_first_notified = True
         else:
             self._log("REAL_OPEN_FAIL", {**data, "note": fill.notes})
+            self._notify("REAL_OPEN_FAIL", {**data, "note": fill.notes})
 
     def _real_close(self, sim_exit: float, reason: str, sim_pnl: float):
         """Chiusura REALE (reduce-only della quota worker) + confronto col sim."""