Add shared D&D prompt assets package

internal/modules/chunk/dnd/scenes/assets/scriptorium/prompts/dnd.scenes.yaml

@@ -13,13 +13,13 @@ inputs:
     content_type: text/plain
 messages:
   - role: system
-    content_file: ./shared/system.md
+    content_file: ./common-dnd-system.md
   - role: user
-    content_file: ./shared/transcript.md
+    content_file: ./common-dnd-transcript.md
     cache_control:
       type: ephemeral
   - role: user
-    content_file: ./shared/references.md
+    content_file: ./common-dnd-references.md
     cache_control:
       type: ephemeral
   - role: user