semesterprojekt: finalize 1.0 deliverable (run profiles, dungeon room, README)

- pom.xml: exec-maven-plugin run profiles (@run console, @gui Swing)
- rooms.yaml: add dungeon room reachable south of the kitchen
- README.md: project overview, build/run/play instructions
- .gitignore: ignore brainstorming companion dir (.superpowers/)

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

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

@@ -6,6 +6,7 @@
   exits:
     north: hallway
     east: cellar
+    south: dungeon
   items: [letter, lamp]
   npcs: [old_man]
 
@@ -39,3 +40,12 @@
     west: kitchen
   items: []
   npcs: []
+
+- id: dungeon
+  name: Dungeon
+  description: |
+    A dark, damp room.
+  exits:
+    north: kitchen
+  items: []
+  npcs: []