fix(identity): clear managed presentation on logout

src/main/java/games/dmg/leaf/LeafListener.java

@@ -12,6 +12,7 @@ import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
 
 /** Handles player lifecycle events that affect Leaf protection. */
 public final class LeafListener implements Listener {
@@ -38,6 +39,11 @@ public final class LeafListener implements Listener {
         }
     }
 
+    @EventHandler
+    public void onQuit(PlayerQuitEvent event) {
+        runtime.removePresentation(event.getPlayer());
+    }
+
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onDamage(EntityDamageEvent event) {
         if (event.isCancelled() || event.getFinalDamage() <= 0.0

src/test/java/games/dmg/leaf/LeafListenerLifecycleTest.java

@@ -0,0 +1,24 @@
+package games.dmg.leaf;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+import java.time.Clock;
+import java.util.logging.Logger;
+import org.bukkit.entity.Player;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.junit.jupiter.api.Test;
+
+final class LeafListenerLifecycleTest {
+    @Test
+    void removesSessionOwnedPresentationWhenAPlayerQuits() {
+        LeafRuntime runtime = mock(LeafRuntime.class);
+        Player player = mock(Player.class);
+        PlayerQuitEvent event = mock(PlayerQuitEvent.class);
+        org.mockito.Mockito.when(event.getPlayer()).thenReturn(player);
+
+        new LeafListener(runtime, Clock.systemUTC(), Logger.getAnonymousLogger()).onQuit(event);
+
+        verify(runtime).removePresentation(player);
+    }
+}