v0.4.7

Fixed

• Unix --auto-update could take a node down instead of upgrading it. The node
  launched install.sh as a child process, and the installer stops the
  warren-node service to swap the binary, which killed the still-running
  installer (its parent died) before the swap finished: service stopped, binary
  not replaced, node offline until a manual reinstall. The updater now runs
  detached from the service: a systemd transient unit on Linux (its own cgroup,
  independent of the warren-node unit's restart), or a new session via setsid
  elsewhere (so launchd's process-group teardown does not reach it). This mirrors
  the Windows detached-helper design added in 0.4.6. Node-side only; reinstall a
  node once to pick up the fixed updater.