docs(install): surface worker daemon flags in installer next-steps

[ralyodio]

What

The curl | sh installer's post-install Next steps only showed foreground c0mpute worker start. Add a "Run the worker in the background" block so new installs discover the daemon lifecycle shipped in v0.2.6 (#11, #12).

Changes

scripts/install.sh next-steps now also prints:

Run the worker in the background:
  c0mpute worker start -d   # detach as a daemon (PID file + log under ~/.local/share/c0mpute)
  c0mpute worker start -a   # start + stream the log; press Ctrl-D to detach, worker keeps running
  c0mpute worker status     # is it running?
  c0mpute worker stop       # stop the daemon
  For a managed service, install the systemd unit:
    scripts/systemd/c0mpute-worker.service  (see its header for setup)

The README already documents -d/-a/Ctrl-D/systemd, so this just closes the installer gap. sh -n scripts/install.sh passes.

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