Ignore unexpected properties when deserializing a ContentBlock (#956)

* Ignore unexpected properties when deserializing a ContentBlock

* Fix deserialization of Reference.Title and more bugs for unknown props

* Remove comments about skipping additional properties

src/ModelContextProtocol.Core/Protocol/ContentBlock.cs

@@ -141,6 +141,7 @@ public abstract class ContentBlock
                         break;
 
                     default:
+                        reader.Skip();
                         break;
                 }
             }

src/ModelContextProtocol.Core/Protocol/ElicitRequestParams.cs

@@ -188,6 +188,7 @@ public sealed class ElicitRequestParams
                             break;
 
                         default:
+                            reader.Skip();
                             break;
                     }
                 }

src/ModelContextProtocol.Core/Protocol/ProgressNotificationParams.cs

@@ -81,6 +81,10 @@ public sealed class ProgressNotificationParams : NotificationParams
                         case "_meta":
                             meta = JsonSerializer.Deserialize(ref reader, McpJsonUtilities.JsonContext.Default.JsonObject);
                             break;
+
+                        default:
+                            reader.Skip();
+                            break;
                     }
                 }
             }

src/ModelContextProtocol.Core/Protocol/Reference.cs

@@ -81,11 +81,16 @@ public abstract class Reference
                         name = reader.GetString();
                         break;
 
+                    case "title":
+                        title = reader.GetString();
+                        break;
+
                     case "uri":
                         uri = reader.GetString();
                         break;
 
                     default:
+                        reader.Skip();
                         break;
                 }
             }

src/ModelContextProtocol.Core/Protocol/ResourceContents.cs

@@ -116,6 +116,7 @@ public abstract class ResourceContents
                         break;
 
                     default:
+                        reader.Skip();
                         break;
                 }
             }