Add new feature.

Added ILogger;
Added IGraphProcessor;

Changed return type of OnExecute method in BaseNode from void to bool;

Sample/Runtime/Models/BackTraceGraphProcessor.cs

@@ -0,0 +1,35 @@
+using System.Collections.ObjectModel;
+using UnityEngine;
+
+namespace Misaki.GraphView.Sample
+{
+    public class BackTraceGraphProcessor : IGraphProcessor
+    {
+        private bool _isRunning;
+        
+        public bool IsRunning => _isRunning;
+        
+        public void UpdateComputeOrder()
+        {
+        }
+
+        public void Execute(ReadOnlyCollection<BaseNode> nodes)
+        {
+            _isRunning = true;
+            nodes.ClearAllExecuteFlag();
+            
+            foreach (var node in nodes)
+            {
+                if (node is OutputNode outputNode)
+                {
+                    outputNode.Execute();
+                }
+            }
+        }
+
+        public void Break()
+        {
+            _isRunning = false;
+        }
+    }
+}

Sample/Runtime/Models/BackTraceGraphProcessor.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 13065a6e26d040a4b3e73e1d66e6cf4f
+timeCreated: 1730564245

Sample/Runtime/Models/Logger.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+
+namespace Misaki.GraphView.Sample
+{
+    public class Logger : ILogger
+    {
+        private readonly List<string> _logs = new ();
+        
+        public Action<BaseNode, string, LogType> OnLog { get; set; }
+        
+        public void LogInfo(BaseNode node, string message)
+        {
+            _logs.Add($"Log Info from node {node.GetType().Name}: {message}");
+            OnLog?.Invoke(node, message, LogType.Info);
+        }
+
+        public void LogWarning(BaseNode node, string message)
+        {
+            _logs.Add($"Log Warning from node {node.GetType().Name}: {message}");
+            OnLog?.Invoke(node, message, LogType.Warning);
+        }
+
+        public void LogError(BaseNode node, string message)
+        {
+            _logs.Add($"Log Error from node {node.GetType().Name}: {message}");
+            OnLog?.Invoke(node, message, LogType.Error);
+        }
+    }
+}

Sample/Runtime/Models/Logger.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: da3c5b7d66754f948efd7f895b5a4b21
+timeCreated: 1730561133