gateway.md: split the opener into what/audience/enable; vhost map in two
tables (swarm-service vhosts declared by their own modules, then the hive
vhost) matching vhosts.nix and the service modules; gateway.enable exists
and is set with mkDefault by the modules that need it; Basic auth scope,
dashboard /health/ prefix, error-page rendering, matrix body limit and
forge link source corrected; nginx internals grouped under one Internals
section with their headings unchanged.
network.md: gateway and dnsmasq run on the host, not in a container;
network.enable is set by the modules that need it; shared-netns firewall
rule covers every swarm service container; hive-priv writes the nspawn
conf; domain sentence rewritten; removed options moved into <details>.
jobq.md: swarm-controller runs its own graph; swarm UI /jobs and BU1LDS
show different graphs drawn by the same component.
observability.md: swarm tier first; history narration cut; network access
deduplicated into a link to network.md; options link made absolute.
matrix.md: swarm.matrix vs deploy.matrix namespaces; tuning, firewall and
SSO options under deploy.matrix; .well-known is served on the hive domain;
roadmap sentence deleted; stale hive-c0re provisioning claims fixed;
serverName upgrade note moved into <details>.
Refs #3902
067f4e5699