Move function-scope library imports to module top in orb engine

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/orb_trader/engine.py

@@ -35,6 +35,10 @@ from apps.orb_trader.screener import (
     load_universe,
 )
 from apps.orb_trader.state import ORBStateManager
+from libs.intraday.features import enrich_daily_bars
+from libs.intraday.orb_simulator import _aggregate_bars, compute_orb_candidates
+from libs.intraday.simulator import _parse_ts, filter_market_hours
+from libs.oracle_client.alpaca import get_snapshots
 
 log = logging.getLogger(__name__)
 
@@ -161,7 +165,6 @@ class ORBTradingEngine:
                         "volume": 0,
                     }]
 
-        from libs.intraday.features import enrich_daily_bars
         self._enrichment = enrich_daily_bars(daily_bars_dict, [date_str])
         self._daily_bars = daily_bars_dict
 
@@ -292,7 +295,6 @@ class ORBTradingEngine:
                             "volume": 0,
                         }]
 
-            from libs.intraday.features import enrich_daily_bars
             self._enrichment = enrich_daily_bars(daily_bars_dict, [date_str])
             self._daily_bars = daily_bars_dict
             daily_bars_count = len([s for s, b in raw_bars.items() if b])
@@ -406,7 +408,6 @@ class ORBTradingEngine:
                         "long": 0, "short": 0, "skip_reason": "breadth",
                     }
 
-        from libs.intraday.orb_simulator import compute_orb_candidates
         self._candidates = compute_orb_candidates(
             bars_by_ticker=bars_by_ticker,
             date_str=date_str,
@@ -483,7 +484,6 @@ class ORBTradingEngine:
         equity = self._get_equity()
 
         # Fetch real-time snapshots for pending candidates via Oracle API
-        from libs.oracle_client.alpaca import get_snapshots
         tickers = [c["ticker"] for c in self._pending_cands]
         snapshots = get_snapshots(tickers)
 
@@ -680,8 +680,6 @@ class ORBTradingEngine:
             timeframe_minutes=5,
         )
 
-        from libs.intraday.orb_simulator import _aggregate_bars
-        from libs.intraday.simulator import _parse_ts, filter_market_hours
 
         group_size = self._params.sim_bar_minutes // 5