test: restore RerankingModelTest, annotate ChatExample with @ignore

- RerankingModelTest: remove @ignore — tests should run normally.
- ChatExample: add @ignore with a comment noting the model file
  (models/codellama-7b.Q2_K.gguf) is not available in the models
  directory.

https://claude.ai/code/session_016atM3vkBsmaia7QGXKex8w

Author: claude

src/test/java/de/kherud/llama/RerankingModelTest.java

@@ -6,10 +6,8 @@
 import org.junit.AfterClass;
 import org.junit.Assert;
 import org.junit.BeforeClass;
-import org.junit.Ignore;
 import org.junit.Test;
 
-@Ignore
 public class RerankingModelTest {
 
 	private static LlamaModel model;

src/test/java/examples/ChatExample.java

@@ -11,6 +11,10 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import org.junit.Ignore;
+
+// Model file (models/codellama-7b.Q2_K.gguf) is not available in the models directory
+@Ignore
 public class ChatExample {
 
     public static void main(String... args) throws Exception {