feat(game): Quest model, QuestLog, START_QUEST effect

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

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

@@ -53,4 +53,11 @@ class EffectsTest {
         Effects.apply(new Effect(Effect.Type.SAY, "boo"), ctx);
         assertThat(((TestIO) ctx.getIo()).allOutput()).contains("boo");
     }
+
+    @Test
+    void startQuestStartsQuestInLog() {
+        GameContext ctx = ctx(Map.of());
+        Effects.apply(new Effect(Effect.Type.START_QUEST, "restore_power"), ctx);
+        assertThat(ctx.getQuestLog().isActive("restore_power")).isTrue();
+    }
 }

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

@@ -0,0 +1,30 @@
+package thb.jeanluc.adventure.game;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class QuestLogTest {
+    @Test
+    void startAdvanceComplete() {
+        QuestLog log = new QuestLog();
+        assertThat(log.isActive("q")).isFalse();
+        log.start("q");
+        assertThat(log.isActive("q")).isTrue();
+        assertThat(log.stageIndex("q")).isEqualTo(0);
+        log.advance("q");
+        assertThat(log.stageIndex("q")).isEqualTo(1);
+        log.complete("q");
+        assertThat(log.isActive("q")).isFalse();
+        assertThat(log.isCompleted("q")).isTrue();
+    }
+
+    @Test
+    void startIgnoredOnceCompleted() {
+        QuestLog log = new QuestLog();
+        log.start("q");
+        log.complete("q");
+        log.start("q");
+        assertThat(log.isActive("q")).isFalse();
+        assertThat(log.isCompleted("q")).isTrue();
+    }
+}