fix: align unrealized PnL across four exchange instances via hub_position_metrics

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

tests/test_hub_agent_mark_price.py

@@ -12,6 +12,7 @@ from agent import _position_mark_price, _ticker_mark_price  # noqa: E402
 
 sys.path.insert(0, str(ROOT))
 from hub_position_metrics import (  # noqa: E402
+    enrich_ccxt_position_metrics_out,
     estimate_linear_swap_upnl_usdt,
     parse_position_unrealized_pnl,
     resolve_position_display_upnl,
@@ -52,6 +53,24 @@ class TestHubAgentMarkPrice(unittest.TestCase):
         )
         self.assertAlmostEqual(pnl, 6.81)
 
+    def test_okx_upl_signed(self):
+        pnl = parse_position_unrealized_pnl(
+            {"info": {"upl": "-2.15"}, "unrealizedPnl": None}
+        )
+        self.assertAlmostEqual(pnl, -2.15)
+
+    def test_enrich_aligns_short_gate_metrics(self):
+        pos = {
+            "side": "short",
+            "contracts": 11,
+            "entryPrice": 73.187,
+            "markPrice": 66.038,
+            "info": {"unrealised_pnl": "7.86"},
+        }
+        out = {"unrealized_pnl": 7.86, "mark_price": 66.038}
+        enrich_ccxt_position_metrics_out(pos, out, contract_size=1.0, funds_decimals=2)
+        self.assertGreater(out["unrealized_pnl"], 70.0)
+
     def test_estimate_short_hype_contract_size(self):
         upnl = estimate_linear_swap_upnl_usdt(
             "short", 73.187, 66.038, 11, 0.1