feat(dynamic): enhance corpus sync script with improved payload parsing, registry checks, and expanded validation logic

tests/dynamic_fixtures/java/servlet_doget/Benign.java

@@ -17,7 +17,7 @@ public class Benign {
         BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
         String line;
         while ((line = reader.readLine()) != null) {
-            System.out.println(line);
+            resp.write(line + "\n");
         }
         p.waitFor();
     }