feat(game): EndingEngine + per-turn end check with summary

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

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

@@ -0,0 +1,50 @@
+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.Ending;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.World;
+
+import java.util.List;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class EndingEngineTest {
+    private GameContext ctx(List<Ending> endings) {
+        Player p = new Player(new Room("k", "K", "d"), 0);
+        World w = new World(Map.of(), Map.of(), Map.of(), "t", "w", Map.of(), endings);
+        return new GameContext(w, p, new TestIO());
+    }
+
+    private Ending ending(String id, boolean victory, String flag) {
+        return new Ending(id, id + "-title", victory,
+                List.of(new Condition(Condition.Type.FLAG, flag)), id + " text");
+    }
+
+    @Test
+    void firstMatchingEndingWinsByOrder() {
+        GameContext ctx = ctx(List.of(ending("victory", true, "won"), ending("fled", false, "fled")));
+        ctx.getState().set("won");
+        ctx.getState().set("fled");
+        assertThat(EndingEngine.triggered(ctx).id()).isEqualTo("victory");
+    }
+
+    @Test
+    void noEndingWhenNoConditionHolds() {
+        GameContext ctx = ctx(List.of(ending("victory", true, "won")));
+        assertThat(EndingEngine.triggered(ctx)).isNull();
+    }
+
+    @Test
+    void renderIncludesTitleTextAndSummary() {
+        GameContext ctx = ctx(List.of(ending("victory", true, "won")));
+        ctx.getState().set("won");
+        String out = EndingEngine.render(EndingEngine.triggered(ctx), ctx, 7).plainText();
+        assertThat(out).contains("victory-title").contains("victory text");
+        assertThat(out).contains("Turns: 7").contains("Quests completed: 0 / 0");
+    }
+}