JVM exit.
   <li>Creates a dedicated <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/net/URLClassLoader.html" title="class or interface in java.net" class="external-link"><code>URLClassLoader</code></a> for the compiled unit, isolating its classes.
   <li>Scans compiled classes for a public static field <code>ROOT_AGENT</code> assignable to <a href="../agents/BaseAgent.html" title="class in com.google.adk.agents"><code>BaseAgent</code></a>. This field serves as the designated entr