Let a walk wait for its delivery's word, and serve the delivery's owner (hq ADR 0239)

While the mesh-delivery seat has a holder on record, a merge that moves no
core module opens its walk and asks nothing until mesh-delivery or a person
says go; nothing of it is registered before its turn, so no other send
carries it. The controller keeps the planner, the gate, sending and the
walk, and gains the verbs the owner asks with: delivery-plan, -order,
-check (a group composed as one future state), deliver, delivery-stop,
delivery-walks; every walk kept is said as plan-moved.

cmd/mesh-controller/watchdogs.go

@@ -442,6 +442,11 @@ func gatherPlans(ctx context.Context, inv *inventory.Inventory, now time.Time) (
 	pause := buildSeatPause(ctx, inv, plans)
 	var out []planFacts
 	for _, p := range plans {
+		// A walk waiting for its delivery's word is not late (novox/hq ADR 0239): its owner keeps the bound
+		// of that wait, and a silent owner is its own condition (D3, holder-silent).
+		if p.Waiting() {
+			continue
+		}
 		_, paused := pausedWaiting(p, pause, now)
 		out = append(out, planFacts{id: p.ID, repository: p.Repository, commit: p.Commit, tier: p.Tier,
 			tiers: len(p.Tiers), entered: p.TierEntered, bound: max(tierAtLeast, 3*p90(measured[p.Repository])),