Added hal Python CLI

Wraps the rescue/chroot/diagnose/fix workflows in a single tool with
LUKS-passphrase keyring caching. Subcommands: status, connect rescue,
connect chroot, diagnose, fix-boot, fix-network, downgrade-kernel,
downgrade-initramfs, reinstall-grub, use-static-ip, upgrade-system,
forget-passphrase.

connect subcommands accept an optional remote command after the host
for non-interactive execution.

README updated to reference hal instead of the previous shell scripts.

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

pyproject.toml

@@ -0,0 +1,29 @@
+[build-system]
+requires = ["setuptools>=64"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "hetzner-arch-luks"
+version = "0.1.0"
+description = "CLI helpers for the hetzner-arch-luks setup: connect to rescue, drop into the encrypted chroot, probe reachability, collect diagnostics."
+readme = "README.md"
+requires-python = ">=3.9"
+authors = [{ name = "Kevin Veen-Birkenbach" }]
+license = { text = "Proprietary" }
+classifiers = [
+  "Environment :: Console",
+  "Operating System :: POSIX :: Linux",
+  "Programming Language :: Python :: 3",
+]
+
+[project.scripts]
+hal = "hetzner_arch_luks.cli:main"
+
+[tool.setuptools]
+package-dir = { "" = "src" }
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+hetzner_arch_luks = ["resources/**/*.sh"]