add migrant resize subcommand for growing the VM disk#11
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Reads DISK_GB from the Migrantfile and grows the VM's disk to match. The VM must be running: the disk is grown live with `virsh blockresize`, then the in-guest partition and filesystem are grown over SSH. Doing it in-guest is necessary because the Ansible playbooks disable cloud-init after first boot (/etc/cloud/cloud-init.disabled), so cloud-init's growpart cannot extend the partition on a later reboot. The remote script derives the root device, partition number, and filesystem type from the live system, so it handles btrfs/xfs/ext rather than assuming a layout. growpart's absence is reported with an install hint. Refuses to shrink, since that needs in-guest fs+partition shrinks first. If the disk image is already at DISK_GB but the guest never caught up, it still grows the in-guest filesystem, doubling as a recovery path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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DISK_GB, then grows the in-guest partition and filesystem live over SSH — no reboot./etc/cloud/cloud-init.disabled), so cloud-init's growpart can't run on a reboot to do this for us.btrfs/xfs/ext2-4), so it isn't tied to one layout. Missinggrowpartis reported with an install hint.virsh blockresizeand the current size is read viavirsh domblkinfo, both through libvirtd, so the command never opens the root/libvirt-qemu-owned image file directly.destroy && upis the supported path.