feat: state-dependent room descriptions (LookCommand resolution)

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

Semesterprojekt/src/test/java/thb/jeanluc/adventure/command/impl/DescriptionStateTest.java

@@ -0,0 +1,34 @@
+package thb.jeanluc.adventure.command.impl;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Condition;
+import thb.jeanluc.adventure.model.DescriptionState;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class DescriptionStateTest {
+    @Test
+    void descriptionSwitchesWithFlag() {
+        Room cellar = new Room("cellar", "Cellar", "Pitch black down here.");
+        cellar.addDescriptionState(new DescriptionState(
+                List.of(new Condition(Condition.Type.FLAG, "power_on")),
+                "Lit now, a workbench stands against the wall."));
+        Player player = new Player(cellar, 0);
+        TestIO io = new TestIO();
+        GameContext ctx = new GameContext(null, player, io);
+
+        new LookCommand().execute(ctx, List.of());
+        assertThat(io.allOutput()).contains("Pitch black");
+
+        io.outputs().clear();
+        ctx.getState().set("power_on");
+        new LookCommand().execute(ctx, List.of());
+        assertThat(io.allOutput()).contains("workbench").doesNotContain("Pitch black");
+    }
+}