feat(loader): load combinations.yaml; demo matches+torch -> lit_torch

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

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

@@ -0,0 +1,7 @@
+- a: matches
+  b: torch
+  consume: [matches, torch]
+  produce: lit_torch
+  response: |
+    You strike a match and touch it to the torch; it catches with a low hiss
+    and burns steady. You now hold a lit torch.

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

@@ -47,3 +47,19 @@
     You ease the door shut again.
   effects:
     - { setFlag: fled }
+
+- type: plain
+  id: matches
+  name: Box of Matches
+  description: A small box of dry matches. They rattle when you shake it.
+
+- type: plain
+  id: torch
+  name: Unlit Torch
+  description: A pitch-soaked torch, waiting for a flame.
+
+- type: plain
+  id: lit_torch
+  name: Lit Torch
+  description: A burning torch, throwing back the dark.
+  light: true

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

@@ -23,7 +23,7 @@
   exits:
     south: kitchen
     west: library
-  items: []
+  items: [torch]
   npcs: []
 
 - id: library
@@ -33,7 +33,7 @@
     An old chest stands in the corner.
   exits:
     east: hallway
-  items: [shovel]
+  items: [shovel, matches]
   npcs: []
 
 - id: cellar