refactor: migrate to US stocks with Alpaca API

- Replace Binance/ccxt with Alpaca REST client (paper + live)
- Add MOC (Market on Close) strategy for overnight gap trading
- Wire sentiment into strategy engine main loop
- Add EMA + bullish candle entry filters to Asian RSI
- Remove crypto-specific exchange factory
- Update config: Alpaca keys replace Binance keys
- 399 tests passing, lint clean

1 files changed, 25 insertions, 3 deletions

diff --git a/services/strategy-engine/tests/test_moc_strategy.py b/services/strategy-engine/tests/test_moc_strategy.py
index 10a6720..1928a28 100644
--- a/services/strategy-engine/tests/test_moc_strategy.py
+++ b/services/strategy-engine/tests/test_moc_strategy.py
@@ -1,6 +1,8 @@
 """Tests for MOC (Market on Close) strategy."""
+
 import sys
 from pathlib import Path
+
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
 from datetime import datetime, timezone
@@ -61,8 +63,28 @@ def test_moc_no_signal_outside_buy_window():
 def test_moc_buy_signal_in_window():
     s = _make_strategy(ema_period=3)
     # Build up history with some oscillation so RSI settles in the 30-70 range
-    prices = [150, 149, 151, 148, 152, 149, 150, 151, 148, 150,
-              149, 151, 150, 152, 151, 153, 152, 154, 153, 155]
+    prices = [
+        150,
+        149,
+        151,
+        148,
+        152,
+        149,
+        150,
+        151,
+        148,
+        150,
+        149,
+        151,
+        150,
+        152,
+        151,
+        153,
+        152,
+        154,
+        153,
+        155,
+    ]
     signals = []
     for i, p in enumerate(prices):
         sig = s.on_candle(_candle(p, hour=20, minute=i * 2, volume=200.0))
@@ -105,7 +127,7 @@ def test_moc_no_buy_on_bearish_candle():
     for i in range(8):
         s.on_candle(_candle(150, hour=20, minute=i * 3, volume=200.0))
     # Bearish candle (open > close)
-    sig = s.on_candle(_candle(149, hour=20, minute=30, open_price=151))
+    s.on_candle(_candle(149, hour=20, minute=30, open_price=151))
     # May or may not signal depending on other criteria, but bearish should reduce chances
     # Just verify no crash