Flatten D&D module prompt asset trees

internal/modules/extract/dnd/spells/assets/prompts/dnd.spells.yaml

@@ -0,0 +1,33 @@
+id: dnd.spells
+version: "v1"
+default_profile: gemini-2-flash
+inputs:
+  - name: transcript
+    required: true
+    content_type: application/json
+  - name: roster
+    required: false
+    content_type: text/plain
+  - name: glossary
+    required: false
+    content_type: text/plain
+messages:
+  - role: system
+    content_file: ./common-dnd-system.md
+  - role: user
+    content_file: ./common-dnd-transcript.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./common-dnd-references.md
+    cache_control:
+      type: ephemeral
+  - role: user
+    content_file: ./dnd/spells/task.md
+  - role: user
+    content_file: ./dnd/spells/instructions.md
+output:
+  format: json
+  validation_mode: json_schema
+  schema_path: dnd_spells.v1.json
+  repair_attempts: 0