Merge pull request #974 from Scriptwonder/fix/cs8632-nullable-warning

fix: remove nullable annotation causing CS8632 warning

Author: Scriptwonder

MCPForUnity/Editor/Services/IPackageUpdateService.cs

@@ -16,7 +16,7 @@ public interface IPackageUpdateService
         /// Returns a cached update result if one exists for today, or null if a network fetch is needed.
         /// Main-thread only (reads EditorPrefs).
         /// </summary>
-        UpdateCheckResult? TryGetCachedResult(string currentVersion);
+        UpdateCheckResult TryGetCachedResult(string currentVersion);
 
         /// <summary>
         /// Performs only the network fetch and version comparison (no EditorPrefs access).

MCPForUnity/Editor/Services/PackageUpdateService.cs

@@ -83,7 +83,7 @@ public UpdateCheckResult CheckForUpdate(string currentVersion)
         }
 
         /// <inheritdoc/>
-        public UpdateCheckResult? TryGetCachedResult(string currentVersion)
+        public UpdateCheckResult TryGetCachedResult(string currentVersion)
         {
             bool isGitInstallation = IsGitInstallation();
             string gitBranch = isGitInstallation ? GetGitUpdateBranch(currentVersion) : "main";

MCPForUnity/Editor/Tools/ManageScene.cs

@@ -1713,8 +1713,7 @@ private static object ValidateScene(bool autoRepair)
                     }
 
                     var prefabStatus = PrefabUtility.GetPrefabInstanceStatus(go);
-                    if (prefabStatus == PrefabInstanceStatus.MissingAsset ||
-                        prefabStatus == PrefabInstanceStatus.Disconnected)
+                    if (prefabStatus == PrefabInstanceStatus.MissingAsset)
                     {
                         brokenPrefabs++;
                         if (issues.Count < maxIssues)