fix(game): suppress endings while the tutorial is active

A command during the walkthrough (e.g. use front_door -> fled) no longer ends
the game mid-tutorial; a pending ending fires once the tutorial finishes or is
skipped.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -84,6 +84,11 @@ public class Game {
 
     /** Ends the game if any ending's conditions are met, printing its screen. */
     private void maybeEnd() {
+        // Don't end the game (win or lose) while the player is still in the tutorial —
+        // a pending ending fires once the walkthrough finishes or is skipped.
+        if (tutorialGuide != null && tutorialGuide.isActive()) {
+            return;
+        }
         Ending e = EndingEngine.triggered(ctx);
         if (e != null) {
             ctx.getIo().print(EndingEngine.render(e, ctx, ctx.getSession().getTurn()));