Hibernate 8 + Jakarta Persistence 4: EntityAgent and stateless sessions demo

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7jUQrypvpE1ix1k7V

output/04-bulk-insert.txt

@@ -0,0 +1,13 @@
+EntityManager.persist x 5000 in one transaction
+  entities held in the persistence context at the end: 5000
+  entity inserts: 5000   statements prepared: 1
+
+EntityAgent.insert x 5000 in one transaction
+  entities held anywhere: 0 (a StatelessSession has no persistence context)
+  entity inserts: 5000   statements prepared: 5000
+
+EntityAgent.insertMultiple(list of 5000)
+  entity inserts: 5000   statements prepared: 1
+
+publisher.id before insert: null
+publisher.id after insert:  1 (insert() itself returns void)