fix: mark Tradier positions off Alpaca real-time trades, not delayed quotes

Exit manager reads position current_price for breakeven/trail ratchets and
the stop-breach guard; Tradier sandbox quotes are 15-min delayed, so marks
lagged reality. Prefer the Alpaca data client's latest trades (real-time),
fall back to Tradier /markets/quotes per missing symbol.

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

tradier_broker/client.py

@@ -339,18 +339,32 @@ class TradierClient:
         raw = _one_or_many(payload.get("positions"), "position")
         if not raw:
             return []
-        # Tradier positions carry no mark — price them off /markets/quotes
+        # Tradier positions carry no mark. Price them off the Alpaca data
+        # client's REAL-TIME trades when available — the exit manager's
+        # breakeven/trail logic reads current_price, and Tradier sandbox
+        # quotes are 15-min delayed (stale marks = lagging trails). Tradier
+        # /markets/quotes is the fallback (real-time on funded live accounts).
         symbols = sorted({str(p["symbol"]) for p in raw if p.get("symbol")})
         lasts: dict[str, float] = {}
-        try:
-            qp = self._request("GET", "/markets/quotes",
-                               params={"symbols": ",".join(symbols)}) or {}
-            for q in _one_or_many(qp.get("quotes"), "quote"):
-                last = q.get("last")
-                if q.get("symbol") and last is not None:
-                    lasts[q["symbol"]] = float(last)
-        except Exception:  # noqa: BLE001 — quotes down: positions still report, unmarked
-            logger.warning("tradier quotes lookup failed; positions unmarked")
+        if self.data_client is not None:
+            try:
+                for sym, t in (self.data_client.get_latest_trades(symbols) or {}).items():
+                    px = t.get("p")
+                    if px is not None:
+                        lasts[sym] = float(px)
+            except Exception:  # noqa: BLE001 — fall through to Tradier quotes
+                logger.warning("alpaca latest-trades mark failed; falling back to tradier quotes")
+        missing = [s for s in symbols if s not in lasts]
+        if missing:
+            try:
+                qp = self._request("GET", "/markets/quotes",
+                                   params={"symbols": ",".join(missing)}) or {}
+                for q in _one_or_many(qp.get("quotes"), "quote"):
+                    last = q.get("last")
+                    if q.get("symbol") and last is not None:
+                        lasts[q["symbol"]] = float(last)
+            except Exception:  # noqa: BLE001 — quotes down: positions still report, unmarked
+                logger.warning("tradier quotes lookup failed; positions unmarked")
         return [translate_position(p, lasts.get(str(p.get("symbol") or ""))) for p in raw]
 
     def get_positions(self, fresh: bool = False) -> list[dict]: