Fix test failures by invalidating EditorConfigurationCache after setting EditorPrefs (#651)

Several tests were setting EditorPrefs values directly but not refreshing the
EditorConfigurationCache singleton, causing it to return stale cached values.
This led to tests expecting certain behavior (e.g., checking remote URL errors)
but getting unexpected errors (e.g., "HTTP transport is disabled").

Added EditorConfigurationCache.Instance.Refresh() calls to:
- ServerCommandBuilderTests.TryBuildCommand_RemoteUrl_ReturnsFalse()
- ServerCommandBuilderTests.TryBuildCommand_LocalUrl_ReturnsCommandOrError()
- ServerManagementServiceCharacterizationTests.TryGetLocalHttpServerCommand_RemoteUrl_ReturnsFalseWithError()
- WriteToConfigTests.SetUp()

This ensures the cache is refreshed when EditorPrefs are modified in tests.

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Helpers/WriteToConfigTests.cs

@@ -66,6 +66,7 @@ namespace MCPForUnityTests.Editor.Helpers
             // Force HTTP transport defaults so expectations match current behavior
             EditorPrefs.SetBool(UseHttpTransportPrefKey, true);
             EditorPrefs.SetString(HttpUrlPrefKey, "http://localhost:8080");
+            EditorConfigCache.Instance.Refresh();
         }
 
         [TearDown]

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/Characterization/ServerManagementServiceCharacterizationTests.cs

@@ -215,6 +215,7 @@ namespace MCPForUnityTests.Editor.Services.Characterization
             // Arrange
             EditorPrefs.SetBool(EditorPrefKeys.UseHttpTransport, true);
             EditorPrefs.SetString(EditorPrefKeys.HttpBaseUrl, "http://remote.server.com:8080");
+            EditorConfigurationCache.Instance.Refresh();
             _service = new ServerManagementService();
 
             // Act

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Services/Server/ServerCommandBuilderTests.cs

@@ -237,6 +237,7 @@ namespace MCPForUnityTests.Editor.Services.Server
             // Arrange
             EditorPrefs.SetBool(EditorPrefKeys.UseHttpTransport, true);
             EditorPrefs.SetString(EditorPrefKeys.HttpBaseUrl, "http://remote.server.com:8080");
+            EditorConfigurationCache.Instance.Refresh();
 
             // Act
             bool result = _builder.TryBuildCommand(out string fileName, out string arguments, out string displayCommand, out string error);
@@ -253,6 +254,7 @@ namespace MCPForUnityTests.Editor.Services.Server
             // Arrange
             EditorPrefs.SetBool(EditorPrefKeys.UseHttpTransport, true);
             EditorPrefs.SetString(EditorPrefKeys.HttpBaseUrl, "http://localhost:8080");
+            EditorConfigurationCache.Instance.Refresh();
 
             // Act
             bool result = _builder.TryBuildCommand(out string fileName, out string arguments, out string displayCommand, out string error);