feat(assassin): add stealth and double jump

src/main/java/games/dmg/spigottyrant/AbilityItemRefreshTask.java

@@ -0,0 +1,45 @@
+package games.dmg.spigottyrant;
+
+import java.time.Clock;
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+
+public final class AbilityItemRefreshTask implements Runnable {
+    private final TyrantStateManager stateManager;
+    private final AbilityReadinessService readiness;
+    private final AbilityItemService items;
+    private final Server server;
+    private final Clock clock;
+
+    public AbilityItemRefreshTask(
+        TyrantStateManager stateManager,
+        AbilityReadinessService readiness,
+        AbilityItemService items,
+        Server server,
+        Clock clock
+    ) {
+        this.stateManager = stateManager;
+        this.readiness = readiness;
+        this.items = items;
+        this.server = server;
+        this.clock = clock;
+    }
+
+    @Override
+    public void run() {
+        if (stateManager.game().lifecycle() != GameLifecycle.RUNNING) {
+            return;
+        }
+        for (Player player : server.getOnlinePlayers()) {
+            PlayerState before = stateManager.player(player.getUniqueId(), player.getName());
+            PlayerState after = readiness.refresh(before, clock.instant());
+            if (!after.equals(before)) {
+                stateManager.updatePlayer(
+                    player.getUniqueId(), player.getName(), current -> after
+                );
+            }
+            items.removeInvalid(player, after);
+            items.recover(player, after);
+        }
+    }
+}