Update scenario.go

Author: stephanos

loadgen/scenario.go

@@ -18,6 +18,7 @@ import (
 	"go.temporal.io/sdk/temporal"
 	"go.uber.org/zap"
 
+	"github.com/temporalio/omes/common/softassert"
 	"github.com/temporalio/omes/loadgen/kitchensink"
 )
 
@@ -432,6 +433,17 @@ func (r *Run) ExecuteAnyWorkflow(ctx context.Context, options client.StartWorkfl
 		return err
 	}
 	if err := execution.Get(ctx, valuePtr); err != nil {
+		// Antithesis assertion: Workflow execution should never fail
+		softassert.Always(
+			false,
+			"Workflow execution should never return an error",
+			map[string]any{
+				"workflow_id": execution.GetID(),
+				"run_id":      execution.GetRunID(),
+				"error":       err.Error(),
+				"workflow":    fmt.Sprintf("%v", workflow),
+			},
+		)
 		return fmt.Errorf("workflow execution failed (ID: %s, run ID: %s): %w", execution.GetID(), execution.GetRunID(), err)
 	}
 	return nil