feat(t208): close candidate decision feedback loop

backend-api/internal/transport/webui/usecase_adapter.go

@@ -216,6 +216,17 @@ func executionReportFrom(report *domain.ExecutionReport) *ExecutionReport {
 		result.Candidates = prettyAuditJSON(&batch.CandidatesJSON)
 		result.Recommendation = prettyAuditJSON(batch.RecommendationJSON)
 	}
+	if dataset := report.DecisionDataset; dataset != nil {
+		result.Observations = prettyValueJSON(dataset.Observations)
+		result.ModelPredictions = prettyValueJSON(map[string]any{
+			"model_run":   dataset.ModelRun,
+			"evaluations": dataset.Evaluations,
+		})
+		result.DeterministicRecommendation = prettyValueJSON(
+			dataset.Recommendation,
+		)
+		result.HumanReviews = prettyValueJSON(dataset.HumanReviews)
+	}
 	if outcome := report.Outcome; outcome != nil {
 		result.Outcome = &ExecutionReportOutcome{
 			ResultType:                   outcome.ResultType,
@@ -247,6 +258,17 @@ func prettyAuditJSON(value *string) string {
 	return string(formatted)
 }
 
+func prettyValueJSON(value any) string {
+	if value == nil {
+		return ""
+	}
+	formatted, err := json.MarshalIndent(value, "", "  ")
+	if err != nil || string(formatted) == "null" || string(formatted) == "[]" {
+		return ""
+	}
+	return string(formatted)
+}
+
 func stringValue(value *string) string {
 	if value == nil {
 		return ""