revert(installer): undo grub-install changes that introduced PXE boot loop

The --no-nvram flag removed the UEFI NVRAM boot entry, causing firmware to
fall through to PXE on every reboot. Restore original --recheck behaviour
which was confirmed working in manual testing.

cmd/installer/install/install.go

@@ -539,8 +539,7 @@ func installBootloader(disk string) error {
 		"--boot-directory="+bootDir,
 		"--bootloader-id=spinifex",
 		"--removable",
-		"--no-nvram",
-		"--skip-fs-probe",
+		"--recheck",
 	)
 	if efiErr != nil {
 		slog.Warn("installBootloader: EFI install failed", "err", efiErr)
@@ -548,7 +547,7 @@ func installBootloader(disk string) error {
 	if biosErr := run("grub-install",
 		"--target=i386-pc",
 		"--boot-directory="+bootDir,
-		"--skip-fs-probe",
+		"--recheck",
 		disk,
 	); biosErr != nil {
 		if efiErr != nil {
@@ -575,7 +574,6 @@ GRUB_TIMEOUT=5
 GRUB_DISTRIBUTOR=Spinifex
 GRUB_CMDLINE_LINUX_DEFAULT=""
 GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200 systemd.show_status=1"
-GRUB_DISABLE_OS_PROBER=true
 `
 
 	if err := os.WriteFile(filepath.Join(mountRoot, "etc/default/grub"), []byte(grubDefault), 0o644); err != nil {