feat(game): autosave on quest completion

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

@@ -62,6 +62,7 @@ public final class QuestEngine {
         ctx.getQuestLog().complete(q.id());
         ctx.getIo().print(StyledText.builder()
                 .heading("★ Quest complete: ").plain(q.title()).build());
+        ctx.save();
     }
 
     public static QuestView viewOf(GameContext ctx) {

Semesterprojekt/src/test/java/thb/jeanluc/adventure/game/QuestAutosaveTest.java

@@ -0,0 +1,37 @@
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Quest;
+import thb.jeanluc.adventure.model.QuestStage;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class QuestAutosaveTest {
+
+    @Test
+    void questCompletionTriggersSaveCallback() {
+        Quest q = new Quest("q", "Quest", true, List.of(
+                new QuestStage("Do it", List.of(new Condition(Condition.Type.FLAG, "a")), List.of())),
+                List.of());
+        Room k = new Room("k", "K", "d");
+        World w = new World(Map.of("k", k), Map.of(), Map.of(), "t", "w", Map.of("q", q));
+        GameContext ctx = new GameContext(new GameSession(w, new Player(k, 0), "slot"), new TestIO());
+        AtomicInteger saves = new AtomicInteger();
+        ctx.setSaveCallback(saves::incrementAndGet);
+
+        QuestEngine.tick(ctx);          // starts quest; not complete yet
+        assertThat(saves.get()).isZero();
+        ctx.getState().set("a");
+        QuestEngine.tick(ctx);          // completes quest → autosave
+        assertThat(saves.get()).isEqualTo(1);
+    }
+}