fix: MAX_TOKEN_BYTES -> MAX_TOKEN_LENGTH

Author: mattrmc1

lib/sdk/server-ai/src/main/java/com/launchdarkly/sdk/server/ai/internal/ResumptionTokens.java

@@ -14,7 +14,7 @@
  * This class is an internal implementation detail and is not part of the supported API.
  */
 final class ResumptionTokens {
-  private static final int MAX_TOKEN_BYTES = 4096;
+  private static final int MAX_TOKEN_LENGTH = 4096;
   private static final Base64.Encoder ENCODER = Base64.getUrlEncoder().withoutPadding();
   private static final Base64.Decoder DECODER = Base64.getUrlDecoder();
 
@@ -61,8 +61,8 @@ static Decoded decode(String token) {
     if (token == null) {
       throw new IllegalArgumentException("Resumption token must not be null");
     }
-    if (token.length() > MAX_TOKEN_BYTES) {
-      throw new IllegalArgumentException("Resumption token exceeds maximum length of " + MAX_TOKEN_BYTES + " bytes");
+    if (token.length() > MAX_TOKEN_LENGTH) {
+      throw new IllegalArgumentException("Resumption token exceeds maximum length of " + MAX_TOKEN_LENGTH + " characters");
     }
 
     String json;