feat(live): reconcile resting + orphan single-leg + circuit-breaker venue-lock + FEED_BOOK_GAP

Codice della tornata v1.1.27/28 (gia' in produzione, mai committato):
- reconcile_account: estensione ordini RESTING (FILLED_UNBOOKED/MISSING/STALE,
  caso MR02_BTC: TP fillato di notte scoperto ore dopo) + expected_resting in books
- strategy_worker: orphan_legs su REAL_CLOSE_PARTIAL anche single-leg, persistito
- execution: circuit-breaker su venue-lock admin (stop ordini dopo errori ripetuti)
- runner/hourly_report: alert FEED_BOOK_GAP + timestamp closed trades
- cerbero_client: get_open_orders (merge all + trigger_all)
Test: 12 nuovi, suite completa 126 passed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/live/cerbero_client.py

@@ -80,6 +80,16 @@ class CerberoClient:
     def get_positions(self, currency: str = "ETH") -> list[dict]:
         return self._post("/mcp-deribit/tools/get_positions", {"currency": currency})
 
+    def get_open_orders(self, currency: str = "USDC", type: str = "all") -> list[dict]:
+        """Ordini APERTI sul conto (limit resting + trigger non scattati). Ogni voce:
+        {order_id, instrument, direction, order_type, order_state, amount,
+        filled_amount, price, trigger_price, reduce_only, label}. NB Deribit puo'
+        omettere i trigger untriggered da type='all' -> per i bracket interrogare
+        anche type='trigger_all' e fare merge per order_id."""
+        out = self._post("/mcp-deribit/tools/get_open_orders",
+                         {"currency": currency, "type": type})
+        return out if isinstance(out, list) else out.get("orders", [])
+
     # --- Trading ---
 
     def place_order(