Add deploy/unibus-membershipd.service (Restart=always, binds both planes to
0.0.0.0 for LAN reachability), an idempotent deploy/install.sh that builds the
binary, symlinks the unit, and enables+starts it, plus deploy/README.md with
operate/health instructions.
Restart=always is deliberate: a clean SIGTERM exits 0 and Restart=on-failure
would not restart it, leaving the service silently dead (the sqlite_api gotcha).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
