Set transport, jsonMapper, and jsonschemavalidator member

variable to protected, so that extensions/subclasses can access.

Author: Scott Lewis

mcp-core/src/main/java/io/modelcontextprotocol/server/McpAsyncServer.java

@@ -91,11 +91,11 @@ public class McpAsyncServer {
 
 	private static final Logger logger = LoggerFactory.getLogger(McpAsyncServer.class);
 
-	private final McpServerTransportProviderBase mcpTransportProvider;
+	protected final McpServerTransportProviderBase mcpTransportProvider;
 
-	private final McpJsonMapper jsonMapper;
+	protected final McpJsonMapper jsonMapper;
 
-	private final JsonSchemaValidator jsonSchemaValidator;
+	protected final JsonSchemaValidator jsonSchemaValidator;
 
 	private final McpSchema.ServerCapabilities serverCapabilities;
 

mcp-core/src/main/java/io/modelcontextprotocol/server/McpStatelessAsyncServer.java

@@ -51,9 +51,9 @@ public class McpStatelessAsyncServer {
 
 	private static final Logger logger = LoggerFactory.getLogger(McpStatelessAsyncServer.class);
 
-	private final McpStatelessServerTransport mcpTransportProvider;
+	protected final McpStatelessServerTransport mcpTransportProvider;
 
-	private final McpJsonMapper jsonMapper;
+	protected final McpJsonMapper jsonMapper;
 
 	private final McpSchema.ServerCapabilities serverCapabilities;