fix(test): select persistent UEFI test media without changing boot order

docs/laptop-acceptance.md

@@ -24,6 +24,16 @@ adds the following real guest operations:
    fallback bytes, and firmware BootOrder. Install Btrfs into `/dev/vda3` while
    retaining `/dev/vda1`, explicitly register a HydraOS entry, then verify those
    invariants before the harness deliberately sets BootNext to choose that entry.
+   Subsequent live boots also use verified one-shot BootNext selection. The same
+   SATA DVD drive stays attached throughout, empty during installed boots; no ISO
+   is available to those boots. This keeps OVMF's device entries stable without
+   resetting firmware variables or changing BootOrder. Every deliberate BootNext
+   write is read back and checked against the unchanged BootOrder. If OVMF prunes
+   HydraOS's create-only entry after consuming BootNext, the harness recreates only
+   that known ESP/loader entry before the next selection, and verifies that both
+   registration and selection preserve the original order. Live test consoles
+   reduce kernel console verbosity so asynchronous mount messages cannot corrupt
+   framed JSON; the messages remain in the guest kernel log.
 2. Boot without ISO, verify the packaged Fastfetch art and doctor, install version
    1.0 of a locally created EAPI 8 Portage package, and create a real qcow2 plus
    profile/data sentinels under HOME. The fixture has no sources or dependencies;