Harden strategy SoT: fail-closed funds gate, shared open pipeline, LIVE switch guards.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_auto_usdc.py

@@ -103,3 +103,24 @@ def test_reserve_perp_margin() -> None:
 
     assert r["acted"] is True
     assert wallets.convert.call_args.kwargs["amount"] == 50.0
+
+
+def test_force_does_not_bypass_cooldown() -> None:
+    import app.strategy.auto_usdc as m
+    import time
+
+    m._last_attempt_ts = time.time()
+    cap = {
+        "option_need_usdc": 100.0,
+        "option_have_usdc": 0.0,
+        "perp_need_usdt": 10.0,
+        "perp_have_usdt": 500.0,
+        "option_can_open": False,
+    }
+    with (
+        patch("app.strategy.auto_usdc._is_okx", return_value=True),
+        patch("app.strategy.auto_usdc.assess_open_capacity", return_value=cap),
+    ):
+        r = ensure_okx_trading_usdc(db=MagicMock(), cap=cap, force=True)
+    assert r["acted"] is False
+    assert "冷却" in r["detail"]