awg-ctrl: keep CPU mode order in /api/metrics; diffbench compare and host runner

The differential bench (GEN 2 and 3.1, with I1, S4=0, upgrade with a 3.x
module) now shows the Go awg-ctrl identical to the TS one. The only real
difference it found: host.cpu was a Go map, so its keys came out sorted
instead of in /proc/stat order.

- tools/diffbench/compare.mjs: decodes vpn:// (Node and Go zlib differ), masks
  live host numbers, Express dev-mode stack traces, temp file names and the
  order of calls from concurrent background work
- tools/diffbench/local.sh: the same run without Docker, stubs only on the
  run's own PATH (for disposable machines)
- run.sh: wait for the background shaping apply before stopping the service,
  otherwise the stub log is cut short

tools/diffbench/run.sh

@@ -17,6 +17,8 @@ i=0; until curl -s -o /dev/null http://127.0.0.1:3005/health; do i=$((i+1)); [ $
 sleep 1   # стартовый apply шейпинга асинхронный — даём ему отработать до сценария
 cd /bench
 node scenario-ctrl.mjs "/out/$NAME.json"
+# фоновый apply шейпинга после restart/upgrade должен доработать, иначе журнал заглушек обрежется
+sleep 3
 kill $PID 2>/dev/null || true; wait $PID 2>/dev/null || true
 node collect.mjs "/out/$NAME.json"
 cp /run/bench/ctrl.log "/out/$NAME.log"