fix(quests): tick the escort engine before the quest engine; guard the valve

Two independent world-logic bugs:

- Game.publishHud ticked QuestEngine before EscortEngine, so the twins_reunited
  flag set by the escort was only observed a full turn later. On the turn the
  twins were reunited, 'quests' still listed the objective as active.

- The valve_wheel/valve recipe had neither 'consume' nor 'requires', so it could
  be repeated indefinitely, minting a fresh ceramic fuse every time. It now
  requires notFlag cellar_drained and explains itself once the cellar is dry.

Semesterprojekt/src/main/java/thb/jeanluc/adventure/game/Game.java

@@ -7,7 +7,6 @@ import thb.jeanluc.adventure.command.CommandRegistry;
 import thb.jeanluc.adventure.command.ParsedCommand;
 import thb.jeanluc.adventure.io.text.Hud;
 import thb.jeanluc.adventure.io.text.MapView;
-import thb.jeanluc.adventure.map.MapLayout;
 import thb.jeanluc.adventure.model.Ending;
 
 import java.util.Optional;
@@ -35,7 +34,11 @@ public class Game {
     /** Optional onboarding guide; null in normal/loaded play. */
     private TutorialGuide tutorialGuide;
 
-    /** Wires the interactive tutorial (New Game only). */
+    /**
+     * Wires the interactive tutorial (New Game only).
+     *
+     * @param tutorialGuide the guide to run alongside the loop
+     */
     public void setTutorialGuide(TutorialGuide tutorialGuide) {
         this.tutorialGuide = tutorialGuide;
     }
@@ -96,9 +99,15 @@ public class Game {
         }
     }
 
+    /**
+     * Ticks the per-turn engines and republishes the whole view state — HUD,
+     * map, quest panel, and room music — to the IO channel.
+     */
     private void publishHud() {
-        QuestEngine.tick(ctx);
+        // EscortEngine first: it sets flags (e.g. twins_reunited) that
+        // QuestEngine's stage-completion conditions read in the same turn.
         EscortEngine.tick(ctx);
+        QuestEngine.tick(ctx);
         ctx.getIo().setHud(new Hud(
                 ctx.getPlayer().getCurrentRoom().getName(),
                 ctx.getPlayer().getGold(),

Semesterprojekt/src/main/resources/world/combinations.yaml

@@ -13,8 +13,12 @@
 - a: valve_wheel
   b: valve
   produce: fuse
+  requires:
+    - { notFlag: cellar_drained }
   effects:
     - { setFlag: cellar_drained }
+  failText: |
+    The cellar is already drained; the valve turns freely on nothing.
   response: |
     You fit the wheel and crank it hard. The valve groans, the black water
     drops away — and a ceramic fuse, washed loose, settles at your feet.