refactor: make Evaluator package-private (not public API in v1.0)

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ctawiah

lib/sdk/server-ai/README.md

@@ -78,10 +78,6 @@ if (judge != null) {
 }
 ```
 
-`Evaluator` runs several judges over the same input/output with per-judge fault isolation and a
-per-judge timeout, returning one `JudgeResult` per judge in order. `Evaluator.noop()` returns an
-empty result list.
-
 ## Internal API convention
 
 Public, supported types live directly under `com.launchdarkly.sdk.server.ai` (and its documented

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

@@ -26,8 +26,10 @@
  * <p>
  * The evaluator does not record results; recording the returned {@link JudgeResult}s (for example
  * via a tracker) is the caller's responsibility. Instances are immutable and thread-safe.
+ * <p>
+ * This type is not part of the public API in v1.0 and may change without notice.
  */
-public final class Evaluator {
+final class Evaluator {
   /**
    * Default per-judge timeout used when one is not supplied.
    */