Clean up namespaces (#410)

No meaningful code changes, just lots of namespace shuffling to have fewer namespaces and to put things in better namespaces.

src/ModelContextProtocol/Protocol/ListResourcesResult.cs

@@ -0,0 +1,28 @@
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.Protocol;
+
+/// <summary>
+/// Represents a server's response to a <see cref="RequestMethods.ResourcesList"/> request from the client, containing available resources.
+/// </summary>
+/// <remarks>
+/// <para>
+/// This result is returned when a client sends a <see cref="RequestMethods.ResourcesList"/> request to discover available resources on the server.
+/// </para>
+/// <para>
+/// It inherits from <see cref="PaginatedResult"/>, allowing for paginated responses when there are many resources.
+/// The server can provide the <see cref="PaginatedResult.NextCursor"/> property to indicate there are more
+/// resources available beyond what was returned in the current response.
+/// </para>
+/// <para>
+/// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for details.
+/// </para>
+/// </remarks>
+public class ListResourcesResult : PaginatedResult
+{
+    /// <summary>
+    /// A list of resources that the server offers.
+    /// </summary>
+    [JsonPropertyName("resources")]
+    public List<Resource> Resources { get; set; } = [];
+}