Append newline to "-o json" for validate/summary/run

acceptance/bundle/variables/host/output.txt

@@ -23,6 +23,7 @@ Error: failed during request visitor: parse "https://${var.host}": invalid chara
     "host": "${var.host}"
   }
 }
+
 Exit code: 1
 
 >>> errcode [CLI] bundle validate

cmd/bundle/run.go

@@ -173,6 +173,7 @@ task or a Python wheel task, the second example applies.
 				if err != nil {
 					return err
 				}
+				_, _ = cmd.OutOrStdout().Write([]byte{'\n'})
 			default:
 				return fmt.Errorf("unknown output type %s", root.OutputType(cmd))
 			}

cmd/bundle/summary.go

@@ -74,6 +74,7 @@ func newSummaryCommand() *cobra.Command {
 				return err
 			}
 			_, _ = cmd.OutOrStdout().Write(buf)
+			_, _ = cmd.OutOrStdout().Write([]byte{'\n'})
 		default:
 			return fmt.Errorf("unknown output type %s", root.OutputType(cmd))
 		}

cmd/bundle/validate.go

@@ -20,7 +20,9 @@ func renderJsonOutput(cmd *cobra.Command, b *bundle.Bundle) error {
 	if err != nil {
 		return err
 	}
-	_, _ = cmd.OutOrStdout().Write(buf)
+	out := cmd.OutOrStdout()
+	_, _ = out.Write(buf)
+	_, _ = out.Write([]byte{'\n'})
 	return nil
 }