fix: volatile boolean overflow in NonBlockingLineWriter

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: vorburger

src/dev/enola/be/io/NonBlockingLineWriter.java

@@ -11,7 +11,7 @@ public class NonBlockingLineWriter extends TaskWithoutInputOutput implements Lin
 
     private final LineWriter delegate;
     private final BlockingQueue<Object> queue;
-    private boolean overflow;
+    private volatile boolean overflow;
 
     public NonBlockingLineWriter(int queueCapacity, LineWriter delegate) {
         this.delegate = delegate;