FTL's generated dnsmasq.conf has no conf-dir: /etc/dnsmasq.d/ is never
read (the 2026-08-24 scratch-name test proved the file was inert; names
only resolved from the query cache). The only file-based local-record
mechanism is hostsdir=/etc/pihole/hosts. Mount the record file there.
Doc: record the pitfall in Pi-hole.md.