Refactor: load execution profiles from YAML and split prompt definitions into promptdef repository

internal/profile/testdata/missing_id.yaml

@@ -1,11 +1,2 @@
-version: 1.0.0
-description: Missing ID
-inputs:
-  - name: transcript
-    required: true
-templates:
-  - role: system
-    content: Hello
-output_format: text
-validation:
-  validation_mode: none
+endpoint: http://localhost:8000/v1
+model: gpt-4o-mini