DemandBoard

One peer's advertised appetite across the edges it serves — the value carried in a peer's slot of the demand board (design §6).

A peer publishes, into its own slot of an EphemeralMap, a DemandBoard naming how much more service each child edge could usefully take right now. The parent folds the live (non-expired) slots when it ranks children: a crashed peer's slot ages out by local receive time, so its stale advertisement stops steering (design §6, "stale-demand safety").

DemandBoard is advisory, never authority — exactly like the Demand values it carries. It can be stale, duplicated, or lost, and the worst outcome is entitlement briefly parked in the wrong pocket; it can never authorize a spend, because spends check the ledger's holdings, which are blind to demand. That separation is a type distinction (this rides an EphemeralMap, entitlement rides the ledger) that cannot be quietly violated.