feat(tutorial): Tutorial model + TutorialLoader + tutorial.yaml content

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Semesterprojekt/src/test/resources/world/tutorial.yaml

@@ -0,0 +1,14 @@
+intro: |
+  Test intro.
+steps:
+  - instruction: "Look: type 'look'."
+    expect: look
+    confirm: "Looked."
+    hint: "Type look."
+  - instruction: "Take: type 'take <item>'."
+    expect: take
+    minArgs: 1
+    confirm: "Took it."
+    hint: "Take something."
+closingTips: |
+  Test tips.