Reorganized hal CLI into subcommand groups + MIT licensed

CLI structure now:
  hal {status,diagnose,unlock,forget} HOST
  hal connect {rescue,chroot,server} HOST [CMD]
  hal setup   {image,dropbear,grub,encrypt-root} HOST
  hal fix     {boot,network,grub,kernel,static-ip,upgrade,expand-fs} HOST

Added subcommands cover the previously-manual sections of the README:
  setup image       — upload autosetup + run installimage
  setup dropbear    — install dropbear + mkinitcpio plugins + patch HOOKS
  setup grub        — initial grub install for LUKS boot
  setup encrypt-root — full LUKS conversion of installed root
  connect server    — SSH to booted Arch (vs rescue/chroot)
  unlock            — cryptroot-unlock via dropbear with passphrase from keyring
  fix expand-fs     — lvresize + btrfs resize

Renames (breaking):
  upgrade-system    -> fix upgrade
  expand-fs         -> fix expand-fs
  forget-passphrase -> forget
  reinstall-grub    -> fix grub
  downgrade-kernel  -> fix kernel
  use-static-ip     -> fix static-ip
  fix-{boot,network} -> fix {boot,network}
  install-{image,grub} -> setup {image,grub}
  setup-dropbear    -> setup dropbear
  encrypt-root      -> setup encrypt-root

Removed downgrade-initramfs (never verified, narrow use case).

README rewritten to reference only hal commands; raw bash blocks for
pacman/cryptsetup/grub-install/mount/chroot are gone. Added autosetup.example
as a template for `hal setup image --autosetup PATH`.

Licensed under MIT (LICENSE file added). Author and homepage shown in
hal --version, hal --help, pyproject.toml, and README.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

autosetup.example

@@ -0,0 +1,31 @@
+##  Hetzner Online GmbH - installimage - config
+##  Copy to a working file, adjust DRIVE / HOSTNAME / sizes to your box,
+##  then upload via:  hal install-image <host> --autosetup <path>
+
+## Adjust DRIVE1 / DRIVE2 to your actual disks. Typical values:
+##   - /dev/sda /dev/sdb     (SATA/SAS auction boxes)
+##   - /dev/nvme0n1 /dev/nvme1n1  (NVMe-based servers)
+DRIVE1 /dev/sda
+DRIVE2 /dev/sdb
+
+##  SOFTWARE RAID:
+##  activate software RAID?  < 0 | 1 >
+SWRAID 1
+##  Choose the level for the software RAID < 0 | 1 | 10 >
+SWRAIDLEVEL 1
+
+##  BOOTLOADER:
+BOOTLOADER grub
+
+##  HOSTNAME:  adapt to your needs
+HOSTNAME hetzner-arch-luks
+
+##  PARTITIONS / FILESYSTEMS:
+##  /boot must be its own partition (btrfs/ext4); root and swap on LVM.
+PART /boot  btrfs     512M
+PART lvm    vg0       all
+LV vg0   swap   swap     swap         8G
+LV vg0   root   /        btrfs        10G
+
+##  OPERATING SYSTEM IMAGE:
+IMAGE /root/.oldroot/nfs/install/../images/archlinux-latest-64-minimal.tar.gz