Show rootfs sizes in image list

Replace the noisy rootfs path column in `banger image list` with the current rootfs file size so the table is easier to scan.

Render a ROOTFS SIZE column from the on-disk image size, fall back to `-` when the artifact cannot be statted, and keep the existing image summary output unchanged.

Add CLI coverage for both the formatted size case and the missing-file fallback, then rebuild and check the live command output.

internal/cli/banger.go

@@ -809,12 +809,7 @@ func newImageListCommand() *cobra.Command {
 			if err != nil {
 				return err
 			}
-			w := tabwriter.NewWriter(cmd.OutOrStdout(), 0, 8, 2, ' ', 0)
-			fmt.Fprintln(w, "ID\tNAME\tMANAGED\tROOTFS\tCREATED")
-			for _, image := range result.Images {
-				fmt.Fprintf(w, "%s\t%s\t%t\t%s\t%s\n", shortID(image.ID), image.Name, image.Managed, image.RootfsPath, relativeTime(image.CreatedAt))
-			}
-			return w.Flush()
+			return printImageListTable(cmd.OutOrStdout(), result.Images)
 		},
 	}
 }
@@ -1318,6 +1313,38 @@ func printImageSummary(out anyWriter, image model.Image) error {
 	return err
 }
 
+func printImageListTable(out anyWriter, images []model.Image) error {
+	w := tabwriter.NewWriter(out, 0, 8, 2, ' ', 0)
+	if _, err := fmt.Fprintln(w, "ID\tNAME\tMANAGED\tROOTFS SIZE\tCREATED"); err != nil {
+		return err
+	}
+	for _, image := range images {
+		if _, err := fmt.Fprintf(
+			w,
+			"%s\t%s\t%t\t%s\t%s\n",
+			shortID(image.ID),
+			image.Name,
+			image.Managed,
+			rootfsSizeLabel(image.RootfsPath),
+			relativeTime(image.CreatedAt),
+		); err != nil {
+			return err
+		}
+	}
+	return w.Flush()
+}
+
+func rootfsSizeLabel(path string) string {
+	info, err := os.Stat(path)
+	if err != nil {
+		return "-"
+	}
+	if info.Size() <= 0 {
+		return "0"
+	}
+	return model.FormatSizeBytes(info.Size())
+}
+
 func printVMPortsTable(out anyWriter, result api.VMPortsResult) error {
 	type portRow struct {
 		Proto    string

internal/cli/cli_test.go

@@ -474,6 +474,51 @@ func TestAbsolutizeImageRegisterPaths(t *testing.T) {
 	}
 }
 
+func TestPrintImageListTableShowsRootfsSizes(t *testing.T) {
+	rootfs := filepath.Join(t.TempDir(), "rootfs.ext4")
+	if err := os.WriteFile(rootfs, nil, 0o644); err != nil {
+		t.Fatalf("WriteFile(%s): %v", rootfs, err)
+	}
+	if err := os.Truncate(rootfs, 8*1024); err != nil {
+		t.Fatalf("Truncate(%s): %v", rootfs, err)
+	}
+
+	var out bytes.Buffer
+	err := printImageListTable(&out, []model.Image{
+		{
+			ID:         "0123456789abcdef",
+			Name:       "alpine",
+			Managed:    true,
+			RootfsPath: rootfs,
+			CreatedAt:  time.Now().Add(-1 * time.Hour),
+		},
+		{
+			ID:         "fedcba9876543210",
+			Name:       "missing",
+			Managed:    false,
+			RootfsPath: filepath.Join(t.TempDir(), "missing.ext4"),
+			CreatedAt:  time.Now().Add(-2 * time.Hour),
+		},
+	})
+	if err != nil {
+		t.Fatalf("printImageListTable() error = %v", err)
+	}
+
+	output := out.String()
+	if !strings.Contains(output, "ROOTFS SIZE") {
+		t.Fatalf("output = %q, want rootfs size header", output)
+	}
+	if !strings.Contains(output, "alpine") || !strings.Contains(output, "8K") {
+		t.Fatalf("output = %q, want alpine row with 8K size", output)
+	}
+	if strings.Contains(output, rootfs) {
+		t.Fatalf("output = %q, should not include rootfs path", output)
+	}
+	if !strings.Contains(output, "missing") || !strings.Contains(output, "-") {
+		t.Fatalf("output = %q, want fallback size for missing image", output)
+	}
+}
+
 func TestPrintVMPortsTableSortsAndRendersURLEndpoints(t *testing.T) {
 	result := api.VMPortsResult{
 		Name: "alpha",