Remove obsolete IMcpEndpoint, IMcpClient, IMcpServer interfaces and McpClientFactory

Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>

Author: Copilot

src/ModelContextProtocol.Core/Client/IMcpClient.cs

@@ -10,9 +10,7 @@ namespace ModelContextProtocol.Client;
 /// <summary>
 /// Represents an instance of a Model Context Protocol (MCP) client session that connects to and communicates with an MCP server.
 /// </summary>
-#pragma warning disable CS0618 // Type or member is obsolete
-public abstract partial class McpClient : McpSession, IMcpClient
-#pragma warning restore CS0618 // Type or member is obsolete
+public abstract partial class McpClient : McpSession
 {
     /// <summary>Creates an <see cref="McpClient"/>, connecting it to the specified server.</summary>
     /// <param name="clientTransport">The transport instance used to communicate with the server.</param>

src/ModelContextProtocol.Core/Client/McpClient.Methods.cs

@@ -5,9 +5,7 @@ namespace ModelContextProtocol.Client;
 /// <summary>
 /// Represents an instance of a Model Context Protocol (MCP) client session that connects to and communicates with an MCP server.
 /// </summary>
-#pragma warning disable CS0618 // Type or member is obsolete
-public abstract partial class McpClient : McpSession, IMcpClient
-#pragma warning restore CS0618 // Type or member is obsolete
+public abstract partial class McpClient : McpSession
 {
     /// <summary>
     /// Gets the capabilities supported by the connected server.

src/ModelContextProtocol.Core/Client/McpClient.cs

@@ -36,7 +36,7 @@ public class McpClientHandlers
     /// </para>
     /// <para>
     /// Handlers provided via <see cref="NotificationHandlers"/> will be registered with the client for the lifetime of the client.
-    /// For transient handlers, <see cref="IMcpEndpoint.RegisterNotificationHandler"/> may be used to register a handler that can
+    /// For transient handlers, <see cref="McpSession.RegisterNotificationHandler"/> may be used to register a handler that can
     /// then be unregistered by disposing of the <see cref="IAsyncDisposable"/> returned from the method.
     /// </para>
     /// </remarks>

src/ModelContextProtocol.Core/Client/McpClientFactory.cs

@@ -5,9 +5,7 @@
 
 namespace ModelContextProtocol;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-public abstract partial class McpSession : IMcpEndpoint, IAsyncDisposable
-#pragma warning restore CS0618 // Type or member is obsolete
+public abstract partial class McpSession : IAsyncDisposable
 {
     /// <summary>
     /// Sends a JSON-RPC request and attempts to deserialize the result to <typeparamref name="TResult"/>.

src/ModelContextProtocol.Core/Client/McpClientHandlers.cs

@@ -26,9 +26,7 @@ namespace ModelContextProtocol;
 /// All MCP sessions should be properly disposed after use as they implement <see cref="IAsyncDisposable"/>.
 /// </para>
 /// </remarks>
-#pragma warning disable CS0618 // Type or member is obsolete
-public abstract partial class McpSession : IMcpEndpoint, IAsyncDisposable
-#pragma warning restore CS0618 // Type or member is obsolete
+public abstract partial class McpSession : IAsyncDisposable
 {
     /// <summary>Gets an identifier associated with the current MCP session.</summary>
     /// <remarks>

src/ModelContextProtocol.Core/IMcpEndpoint.cs

@@ -14,9 +14,7 @@ namespace ModelContextProtocol.Server;
 /// <summary>
 /// Represents an instance of a Model Context Protocol (MCP) server that connects to and communicates with an MCP client.
 /// </summary>
-#pragma warning disable CS0618 // Type or member is obsolete
-public abstract partial class McpServer : McpSession, IMcpServer
-#pragma warning restore CS0618 // Type or member is obsolete
+public abstract partial class McpServer : McpSession
 {
     /// <summary>
     /// Caches request schemas for elicitation requests based on the type and serializer options.