Implement NinjaTrader 8 adapter for integration

src/NT8.Adapters/NinjaTrader/INT8Adapter.cs

@@ -0,0 +1,49 @@
+using System;
+using NT8.Core.Common.Interfaces;
+using NT8.Core.Common.Models;
+using NT8.Core.Risk;
+using NT8.Core.Sizing;
+
+namespace NT8.Adapters.NinjaTrader
+{
+    /// <summary>
+    /// Interface for NinjaTrader 8 integration adapter
+    /// </summary>
+    public interface INT8Adapter
+    {
+        /// <summary>
+        /// Initialize the adapter with required components
+        /// </summary>
+        void Initialize(IRiskManager riskManager, IPositionSizer positionSizer);
+
+        /// <summary>
+        /// Convert NT8 bar data to SDK format
+        /// </summary>
+        BarData ConvertToSdkBar(string symbol, DateTime time, double open, double high, double low, double close, long volume, int barSize);
+
+        /// <summary>
+        /// Convert NT8 account data to SDK format
+        /// </summary>
+        AccountInfo ConvertToSdkAccount(double equity, double buyingPower, double dailyPnL, double maxDrawdown, DateTime lastUpdate);
+
+        /// <summary>
+        /// Convert NT8 position data to SDK format
+        /// </summary>
+        Position ConvertToSdkPosition(string symbol, int quantity, double averagePrice, double unrealizedPnL, double realizedPnL, DateTime lastUpdate);
+
+        /// <summary>
+        /// Execute strategy intent through NT8
+        /// </summary>
+        void ExecuteIntent(StrategyIntent intent, SizingResult sizing);
+
+        /// <summary>
+        /// Handle order updates from NT8
+        /// </summary>
+        void OnOrderUpdate(string orderId, double limitPrice, double stopPrice, int quantity, int filled, double averageFillPrice, string orderState, DateTime time, string errorCode, string nativeError);
+
+        /// <summary>
+        /// Handle execution updates from NT8
+        /// </summary>
+        void OnExecutionUpdate(string executionId, string orderId, double price, int quantity, string marketPosition, DateTime time);
+    }
+}