fix: remove recvWindow from exchange_info wrapper

Binance exchangeInfo endpoint does not accept recvWindow, causing
RuntimeError when calling opportunity scan or any command that hits
exchange_info().

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

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "coinhunter"
-version = "2.0.7"
+version = "2.0.8"
 description = "Binance-first trading CLI for balances, market data, opportunity scanning, and execution."
 readme = "README.md"
 license = {text = "MIT"}

src/coinhunter/binance/spot_client.py

@@ -44,7 +44,7 @@ class SpotBinanceClient:
         return self._call("account info", self._client.account, recvWindow=self.recv_window)  # type: ignore[no-any-return]
 
     def exchange_info(self, symbol: str | None = None) -> dict[str, Any]:
-        kwargs: dict[str, Any] = {"recvWindow": self.recv_window}
+        kwargs: dict[str, Any] = {}
         if symbol:
             kwargs["symbol"] = symbol
         return self._call("exchange info", self._client.exchange_info, **kwargs)  # type: ignore[no-any-return]