Migrate prompt fixtures to direct definitions

integrations/ckprompt/composition_test.go

@@ -70,13 +70,14 @@ func TestPublicConfigurationAndDefinitionFamiliesRemainIndependent(t *testing.T)
 	inputs, err := promptkit.FilesystemInputs("composition fixture", fstest.MapFS{
 		"config/prompts.yml": &fstest.MapFile{Data: []byte(`prompts:
   briefing:
-    "1":
-      messages:
-        - role: user
-          content: "Hello"
-      output:
-        format: text
-        validation_mode: none
+    version: "1"
+    default_profile: default
+    messages:
+      - role: user
+        content: "Hello"
+    output:
+      format: text
+      validation_mode: none
 backends:
   local:
     endpoint: "https://example.invalid/v1"