Use closed candles for trend signals

tests/test_market_data.py

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+from __future__ import annotations
+
+from crypto_spot_bot.market_data import _closed_candles, _is_closed_kline_row
+from crypto_spot_bot.models import Candle
+
+
+def test_closed_candles_excludes_current_open_interval() -> None:
+    candles = [
+        Candle(0, 100, 101, 99, 100, 10),
+        Candle(3_600_000, 101, 102, 100, 101, 10),
+        Candle(7_200_000, 102, 103, 101, 102, 10),
+    ]
+
+    closed = _closed_candles(candles, "60", now_ms=7_200_000 + 1_000)
+
+    assert [candle.timestamp for candle in closed] == [0, 3_600_000]
+
+
+def test_websocket_kline_requires_confirmed_candle() -> None:
+    assert _is_closed_kline_row({"start": 7_200_000, "confirm": False}, "60") is False
+    assert _is_closed_kline_row({"start": 7_200_000, "confirm": True}, "60") is True