refactor: derive latest MCP protocol version from supported list.

Author: dishtam

mcp-core/src/main/java/io/modelcontextprotocol/server/transport/StdioServerTransportProvider.java

@@ -84,7 +84,7 @@ public StdioServerTransportProvider(McpJsonMapper jsonMapper, InputStream inputS
 
 	@Override
 	public List<String> protocolVersions() {
-		return List.of(ProtocolVersions.MCP_2024_11_05);
+		return List.of(ProtocolVersions.LATEST);
 	}
 
 	@Override

mcp-core/src/main/java/io/modelcontextprotocol/spec/ProtocolVersions.java

@@ -1,5 +1,8 @@
 package io.modelcontextprotocol.spec;
 
+import java.util.Comparator;
+import java.util.List;
+
 public interface ProtocolVersions {
 
 	/**
@@ -26,4 +29,8 @@ public interface ProtocolVersions {
 	 */
 	String MCP_2025_11_25 = "2025-11-25";
 
+	List<String> ALL = List.of(MCP_2024_11_05, MCP_2025_03_26, MCP_2025_06_18, MCP_2025_11_25);
+
+	String LATEST = ALL.stream().max(Comparator.naturalOrder()).orElseThrow();
+
 }