test(combat): await acknowledged native session exit

src/nativeTest/java/games/dmg/fantasystick/BasicAttackEventsNativeTest.java

@@ -326,14 +326,17 @@ class BasicAttackEventsNativeTest {
                                        games.dmg.fantasystick.session.EquipmentSessions sessions,
                                        FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
         var transitioning = (java.util.Map<?, ?>) FantasyStickLifecycleNativeTest.Fixture.field(sessions, "transitioning");
-        for (int i = 0; i < 80; i++) {
+        var deadline = System.nanoTime() + java.util.concurrent.TimeUnit.SECONDS.toNanos(15);
+        while (System.nanoTime() < deadline) {
             if (sessions.active(actor.core.id).isEmpty() && !transitioning.containsKey(actor.core.id)
                     && restoredExitProof(fixture, actor)) return;
-            var task = fixture.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS);
-            assertNotNull(task, "No exit callback before acknowledged receipt and native RESTORED marker");
-            task.run();
+            // The receipt worker can advance independently of queued main-thread callbacks.
+            var task = fixture.tasks.poll(100, java.util.concurrent.TimeUnit.MILLISECONDS);
+            if (task != null) task.run();
         }
-        fail("Session exit did not clear owned native marker and acknowledged receipt before restart");
+        fail("Session exit did not clear owned native marker and acknowledged receipt before restart; "
+            + "active=" + sessions.active(actor.core.id) + ", transitioning=" + transitioning.containsKey(actor.core.id)
+            + ", marker=" + actor.core.marker() + ", receipt_proof=" + restoredExitProof(fixture, actor));
     }
 
     private static void awaitOrdinaryArrival(FantasyStickLifecycleNativeTest.Fixture fixture,