chore: update package javadoc to describe declarative HRPolicyAgent wiring

Author: otaviojava

src/main/java/org/soujava/demos/rag/producer/package-info.java

@@ -20,11 +20,13 @@
  *   <li>{@code ContentRetrieverProducer} &mdash; builds the
  *       {@link dev.langchain4j.rag.content.retriever.ContentRetriever} that
  *       queries the vector store for passages relevant to a question.</li>
- *   <li>{@code HRPolicyAgentProducer} &mdash; binds the chat model and retriever
- *       into the {@link org.soujava.demos.rag.HRPolicyAgent} that generates
- *       grounded answers.</li>
  * </ul>
  *
+ * <p>The {@link org.soujava.demos.rag.HRPolicyAgent} itself is not produced here:
+ * it is registered declaratively with {@code @RegisterAIService}, and the CDI
+ * extension wires it with the default {@code ChatModel} and the
+ * {@code ContentRetriever} produced above.
+ *
  * <p>The classes in this package are package-private on purpose: they are CDI
  * beans discovered by the container, not part of the application's public API.
  *