Remove warnings from build (#29)

* Remove warnings from build

* More fixes.

* Using const for transport types

src/mcpdotnet/Protocol/Types/Argument.cs

@@ -8,9 +8,15 @@ namespace McpDotNet.Protocol.Types;
 /// </summary>
 public class Argument
 {
+    /// <summary>
+    /// The name of the argument.
+    /// </summary>
     [JsonPropertyName("name")]
     public string Name { get; set; } = string.Empty;
 
+    /// <summary>
+    /// The value of the argument to use for completion matching.
+    /// </summary>
     [JsonPropertyName("value")]
     public string Value { get; set; } = string.Empty;
 }