…xmint#1-linuxmint#3) Address the three actionable correctness items from the 2026-06-13 review: linuxmint#1 [High] /boot/efi without the esp flag is now rejected. The reverse check was missing: a vfat /boot/efi partition with empty flags passed validation but its GPT entry lacks the ESP type GUID, so UEFI won't boot it — a silently-broken install. schema.py CustomPartition now requires esp on a /boot/efi partition, with an error explaining why. linuxmint#2 [Med] esp-on-BIOS / bios_grub-on-UEFI now rejected engine-side. The schema can't know firmware mode (runtime), so installer.py validates it in _check_layout_matches_firmware before any partition is created (no destructive action on mismatch). Added a fail-bios-grub-on-uefi regression scenario to the failure-modes CI job. linuxmint#3 [Med] Duplicate LV names within a VG now rejected at validation time (Storage._consistency) instead of failing confusingly at lvcreate. 10 new tests (schema + engine + parsed regression fixture); 240 unit tests pass.

Can't Install GRUB to Root partition #1

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