Demand and knowledge hops now expose Sim::work_in_flight so Bevy, terminal, and agent can show teal/bone cargo moving between nodes instead of only stacks after deposit. Defense: wiki/mechanics/machine-work.md — tokens are the flow substrate rendered; queue depth is stacks and in-flight quanta are moving blips. The Voss desktop -> switch -> host path already existed; this makes the hop visible. Co-authored-by: Cursor <cursoragent@cursor.com>