v1.2.0

1.2.0

• Persistent user-level systemd (Linux): user-scoped installs now
  auto-configure the per-user systemd environment so services install, enable,
  start, and survive logout/reboot. A new UserSystemdManager
  (ensurePersistentUserSystemd()) detects systemctl/loginctl, the current
  user/uid, lingering, the user D-Bus bus, and XDG_RUNTIME_DIR; enables
  lingering via sudo -n loginctl enable-linger when possible (warning with the
  manual command otherwise); and returns a detailed UserSystemdStatus
  (diagnostics + actionable warnings). The systemd driver runs it before
  user-scoped installs and passes a resolved XDG_RUNTIME_DIR to all
  systemctl --user calls, fixing Failed to connect to bus: … errors. Linux
  only, idempotent, never assumes root.

• Scope/privilege warning: install now detects a mismatch between the
  requested scope and the current privilege level — running under sudo/root
  with the default user scope (user services fail as root), or a system-scoped
  install without elevation — and warns with the fix, then proceeds. Backed by a
  new injectable PrivilegeChecker (id -u / net session).

• The CLI now shows warnings by default (info/debug still require --verbose).

• Added --system as a shorthand for --scope system.