v1.2.1

1.2.1

• Fix persistent user systemd on Linux when the process inherited an
  XDG_RUNTIME_DIR belonging to a different user (common under sudo/su or
  deploy scripts): the runtime directory is now derived from the detected uid
  (/run/user/<uid>) and an inherited value is honoured only when it matches,
  so systemctl --user no longer hits another user's bus and fails with
  Failed to connect to bus: Permission denied. That error is now recognised
  with an actionable hint, and a warning is emitted when a mismatched
  XDG_RUNTIME_DIR is overridden.