Clean a bit

src/Managing.Application.Abstractions/Grains/IPriceFetcherGrain.cs

@@ -13,6 +13,5 @@ public interface IPriceFetcherGrain : IGrainWithStringKey
     /// Fetches price data for all supported exchange/ticker combinations
     /// and publishes new candles to their respective streams.
     /// </summary>
-    /// <returns>True if the operation completed successfully, false otherwise</returns>
-    Task<bool> FetchAndPublishPricesAsync();
-}
+    Task FetchAndPublishPricesAsync();
+}