neode_intro_seen / neode_onboarding_complete are per-origin browser state:
after a reinstall (or another node on a DHCP-recycled IP) they describe the
previous node and muted a genuinely fresh install's intro. Root boots now
always ask the backend; a confirmed-fresh answer plays the intro and clears
the stale flag.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>