fix(hub): align Binance chart ticks and improve monitor mark price

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

tests/test_hub_agent_mark_price.py

@@ -8,7 +8,7 @@ from pathlib import Path
 ROOT = Path(__file__).resolve().parents[1]
 sys.path.insert(0, str(ROOT / "manual_trading_hub"))
 
-from agent import _position_mark_price  # noqa: E402
+from agent import _position_mark_price, _ticker_mark_price  # noqa: E402
 
 
 class TestHubAgentMarkPrice(unittest.TestCase):
@@ -27,6 +27,18 @@ class TestHubAgentMarkPrice(unittest.TestCase):
     def test_missing_returns_none(self):
         self.assertIsNone(_position_mark_price({"info": {}}))
 
+    def test_infer_from_notional_and_contracts(self):
+        p = {"notional": 1000, "contracts": 10, "info": {}}
+        px = _position_mark_price(p)
+        self.assertAlmostEqual(px, 100.0)
+
+    def test_ticker_fallback(self):
+        class _Ex:
+            def fetch_ticker(self, sym):
+                return {"mark": 99.5, "info": {}}
+
+        self.assertAlmostEqual(_ticker_mark_price(_Ex(), "BTC/USDT:USDT"), 99.5)
+
 
 if __name__ == "__main__":
     unittest.main()