Private WiFi: unified SSID "Parahub" with shared key "parahub.io"
across all nodes (was per-node random SSID/key, breaking roaming).
Added 802.11r (Fast BSS Transition ~50ms), 802.11k (neighbor AP
reports), 802.11v (AP-assisted roaming) with local FT key generation
(no inter-node key sync needed).
Mesh backhaul ID renamed from "parahub-mesh" to "parahub.io/mesh".
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>