semesterprojekt: implement full text adventure (phases 1-7)

Walking skeleton through Swing GUI: YAML-driven world (4 rooms,
4 items, 1 NPC), HashMap command dispatch with parser, three-tier
item hierarchy (readable / switchable / plain), and end-to-end
NPC give/receive flow. 67 tests green.

Semesterprojekt/src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDERR" class="ch.qos.logback.core.ConsoleAppender">
+        <target>System.err</target>
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} %-5level %logger{0} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDERR"/>
+    </root>
+</configuration>

Semesterprojekt/src/main/resources/world/game.yaml

@@ -0,0 +1,7 @@
+title: Haunted Manor
+version: "1.0"
+startRoom: kitchen
+startGold: 0
+welcomeMessage: |
+  Welcome to the Haunted Manor.
+  Type 'help' to see available commands.

Semesterprojekt/src/main/resources/world/items.yaml

@@ -0,0 +1,24 @@
+- type: readable
+  id: letter
+  name: Letter
+  description: A crumpled piece of paper.
+  readText: |
+    "Meet me at midnight in the cellar. - A."
+
+- type: switchable
+  id: lamp
+  name: Oil Lamp
+  description: An old oil lamp, heavy with fuel.
+  initialState: false
+  onText: The lamp flares to life, casting a warm glow.
+  offText: You snuff out the lamp.
+
+- type: plain
+  id: shovel
+  name: Shovel
+  description: A rusty shovel. Sturdy enough to dig.
+
+- type: plain
+  id: key
+  name: Brass Key
+  description: A small brass key, polished from use.

Semesterprojekt/src/main/resources/world/npcs.yaml

@@ -0,0 +1,12 @@
+- id: old_man
+  name: Old Man
+  description: A stooped old man with a grey beard.
+  greeting: |
+    "Hello, traveller. If you bring me the oil lamp,
+    I will give you the key to the cellar."
+  reactions:
+    - onReceive: lamp
+      response: |
+        "Thank you! Here, take this key."
+      gives: key
+      consumes: lamp

Semesterprojekt/src/main/resources/world/rooms.yaml

@@ -0,0 +1,41 @@
+- id: kitchen
+  name: Old Kitchen
+  description: |
+    A dusty kitchen. Cobwebs hang from the rafters
+    and a letter lies on the table.
+  exits:
+    north: hallway
+    east: cellar
+  items: [letter, lamp]
+  npcs: [old_man]
+
+- id: hallway
+  name: Dark Hallway
+  description: |
+    A long, dimly lit hallway. It smells musty.
+    Faint footsteps echo somewhere far away.
+  exits:
+    south: kitchen
+    west: library
+  items: []
+  npcs: []
+
+- id: library
+  name: Library
+  description: |
+    Tall shelves crammed with mouldering books.
+    An old chest stands in the corner.
+  exits:
+    east: hallway
+  items: [shovel]
+  npcs: []
+
+- id: cellar
+  name: Damp Cellar
+  description: |
+    Cold, damp, and very dark. You can barely
+    make out shapes against the far wall.
+  exits:
+    west: kitchen
+  items: []
+  npcs: []