Fix CompactionTest prompt mismatch causing sendAndWait timeout

Co-authored-by: brunoborges <129743+brunoborges@users.noreply.github.com>

Author: Copilot

src/test/java/com/github/copilot/sdk/CompactionTest.java

@@ -80,7 +80,7 @@ void testShouldTriggerCompactionWithLowThresholdAndEmitEvents() throws Exception
             // Send multiple messages to fill up the context window
             // With such low thresholds, even a few messages should trigger compaction
             session.sendAndWait(
-                    new MessageOptions().setPrompt("Tell me a long story about a dragon. Be very detailed."))
+                    new MessageOptions().setPrompt("Tell me a story about a dragon. Be detailed."))
                     .get(60, TimeUnit.SECONDS);
             session.sendAndWait(
                     new MessageOptions().setPrompt("Continue the story with more details about the dragon's castle."))