Finalize conversation and execution group documentation

generation_error_contract_test.go

@@ -78,6 +78,7 @@ func TestBuiltInRepairGenerationError(t *testing.T) {
 		t.Fatalf("NewEngine: %v", err)
 	}
 	req := simpleGenerationRequest()
+	req.CaptureExchange = true
 	req.Validation = &promptkit.OutputContract{
 		Format:         promptkit.FormatJSON,
 		ValidationMode: promptkit.ValidationJSON,