- Every configured node offline now degrades the Radio stage ("all N nodes
offline") so the wall no longer shows "Listening" with nothing up.
- nodes-hearing only counts configured nodes, so it can't exceed N/N.
- AI chip copy: "no incident writes in the recent window" instead of
"last incident write none in window".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>