A domain variable, the destination host from the proxy's access log, sits beside
the agent one and every query on the board filters on both, so one domain and
its agents show which agents queried it and when.
The controller's status, queue, AGENTS.md and forge-webhook details move to
4-implementation/swarm/controller.md. The metrics, logs and OTEL detail moves to
4-implementation/swarm/telemetry.md. Each leaves a short operator blurb with the
options to touch, and links into the moved text are updated.
