handle new umadump output shapes

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"bufio"
 	"encoding/csv"
-	"encoding/json"
 	"flag"
 	"log/slog"
 	"os"
@@ -46,10 +45,8 @@ func dofile(w *csv.Writer, name string) {
 	}
 	defer f.Close()
 
-	var ism WorkIdleSingleMode
-	d := json.NewDecoder(f)
-	d.DisallowUnknownFields()
-	if err := d.Decode(&ism); err != nil {
+	ism, err := loadISM(f)
+	if err != nil {
 		log.Error("decode", slog.Any("err", err))
 		return
 	}