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Adds a CLI subcommand that downloads a signed Tailscale appliance image (Gokrazy archive format, GAF) from pkgs.tailscale.com, constructs a fresh GPT-partitioned disk from it (mbr.img + a synthesized partition table + boot.img + root.img), formats /perm as ext4 in pure Go via go-diskfs, and ejects the disk so a user running on a regular workstation can flash an SD card or homelab VM disk in one command without installing e2fsprogs. On macOS the target disk is auto-discovered via diskutil, skipping the boot disk and anything bigger than 256 GB out of paranoia. On Linux the user passes --disk=/dev/sdX explicitly. Windows is not supported yet and the command returns an error. The GPT layout matches monogok's full-disk layout via the new public github.com/bradfitz/monogok/disklayout package; a drift- guard test inside monogok asserts the two implementations stay byte-identical so OTA updates against monogok-built images keep working. Behind a ts_omit_flashappliance build tag (on by default). Updates #1866 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: Ic1a8cd185e7039edccb7702ab4104544fcb58d29