The app is cloud-hosted, so a connection's target is not assumed to be
LAN-only: any pinned host (public controller/proxy or VPN-reachable LAN
device) is allowed except cloud-metadata/link-local. KNOWN_DOOR_
CONTROLLERS surfaces the controller type with source links (HeatSync/23b
native -> the heatsynclabs + zyphlar repos; otherwise generic HTTP).
The generic adapter form now explains the request model and every
{slot}/{tag}/{perm}/{door}/{pw} placeholder. Copy and the migration
comment corrected away from "LAN-only".