Refactor: split prompt definition from execution settings and migrate run contracts to prompt_* + execution_target

profiles/dnd.session_recap.yaml

@@ -1,9 +1,14 @@
 id: dnd.session_recap
 version: "1.0.0"
-description: Example D&D session recap profile for demonstration only.
-expected_inputs:
-  - transcript
-  - glossary
+default_profile: local-default
+description: Example D&D session recap prompt definition for demonstration only.
+inputs:
+  - name: transcript
+    required: true
+    content_type: text/markdown
+  - name: glossary
+    required: false
+    content_type: text/yaml
 templates:
   - role: system
     content: |
@@ -21,11 +26,6 @@ templates:
 
       Glossary:
       {{input "glossary"}}
-model_defaults:
-  endpoint: http://localhost:8000/v1
-  model: gpt-4o-mini
-  temperature: 0.3
-  max_tokens: 900
 output_format: markdown
 validation:
   validation_mode: basic