Fix spotbugs

Author: adwsingh

mcp/mcp-cli-api/src/main/java/software/amazon/smithy/java/mcp/cli/ConfigUtils.java

@@ -10,6 +10,7 @@
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -175,6 +176,7 @@ public static McpBundleConfig addMcpBundle(Config config, String toolBundleName,
                 builder.genericConfig(
                         GenericToolBundleConfig.builder().name(toolBundleName).bundleLocation(location).build());
             }
+            default -> throw new IllegalStateException("Unexpected bundle type: " + bundle.type());
         }
 
         var mcpBundleConfig = builder.build();
@@ -230,7 +232,8 @@ private static void install(ExecSpec execSpec) {
     }
 
     private static String captureProcessOutput(Process process) throws IOException {
-        try (BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+        try (BufferedReader in =
+                new BufferedReader(new InputStreamReader(process.getInputStream(), StandardCharsets.UTF_8))) {
             return in.lines().collect(Collectors.joining(System.lineSeparator()));
         }
     }

mcp/mcp-cli/src/main/java/software/amazon/smithy/java/mcp/cli/commands/StartServer.java

@@ -9,7 +9,6 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
-
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Option;
 import picocli.CommandLine.Parameters;
@@ -133,6 +132,7 @@ public void execute(ExecutionContext context) throws IOException {
                             .environmentVariables(System.getenv())
                             .build();
                 }
+                default -> throw new IllegalArgumentException("Unknown tool bundle type: " + toolBundleConfig.type());
             }
 
         }