Strip backtesting, rebalance indicator weights toward leading signals

Remove backtest.py, backtest_gpu.py, metrics.py, local CSV data,
Dukascopy loader, and all backtest CLI modes from main.py. Rebalance
engine weights: leading indicators (divergence, RSI, stochastic, BB)
now carry 66% of signal weight vs 34% for lagging (EMA, MACD). Add
ws_twelvedata.py for live tick streaming. Drop pyarrow and tqdm deps.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ws_twelvedata.py

@@ -0,0 +1,55 @@
+"""Live tick stream from Twelve Data WebSocket API."""
+
+import json
+import asyncio
+import websockets
+from datetime import datetime, timezone
+
+
+API_KEY = "f563b22ffdfd4924955decbe1a8c8701"
+WS_URL = f"wss://ws.twelvedata.com/v1/quotes/price?apikey={API_KEY}"
+SYMBOLS = ["EUR/USD", "GBP/USD", "USD/JPY"]
+
+
+async def stream_ticks():
+    async with websockets.connect(WS_URL) as ws:
+        subscribe = {
+            "action": "subscribe",
+            "params": {
+                "symbols": ",".join(SYMBOLS),
+            },
+        }
+        await ws.send(json.dumps(subscribe))
+        print(f"Subscribed to: {', '.join(SYMBOLS)}")
+        print("-" * 60)
+
+        async for raw in ws:
+            msg = json.loads(raw)
+
+            if msg.get("event") == "subscribe-status":
+                print(f"Status: {msg.get('status')} — {msg.get('message', '')}")
+                continue
+
+            if msg.get("event") == "heartbeat":
+                continue
+
+            if msg.get("event") == "price":
+                ts = datetime.fromtimestamp(msg["timestamp"], tz=timezone.utc)
+                symbol = msg["symbol"]
+                price = msg["price"]
+                print(f"{ts:%H:%M:%S} | {symbol:<8} | {price}")
+
+
+async def main():
+    print(f"Connecting to Twelve Data WebSocket...")
+    print(f"API key: ...{API_KEY[-6:]}")
+    try:
+        await stream_ticks()
+    except KeyboardInterrupt:
+        print("\nStopped.")
+    except websockets.exceptions.ConnectionClosed as e:
+        print(f"\nConnection closed: {e}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())