Say when the node composes again after a seat that did not answer, say what a long pass waits on, and serve the verb compose (issue 774)

On 2026-10-31 ace's route-proxy said only that the vault could not be asked, and ace said nothing for five minutes
while a pass waited after the vault restarted; the retry that already existed was invisible. A refusal for a seat or
a read that did not answer now says when the node composes again ("the node composes again at HH:MM:SS (try N)"), a
retry pass says it starts, a pass that runs on says every minute what it waits on, and the node-engine's verb
compose makes a pass now and says how it went, so a person recovers without a restart.

cmd/mesh-host/nodeagent.go

@@ -668,6 +668,7 @@ func nodeAgent(ctx context.Context, opts options, signer ed25519.PublicKey, trus
 		}
 		if composer != nil {
 			machinesNow.Store(composer) // the machines a failing network part points at, by the placements (issue 774)
+			composerNow.Store(composer) // what the verb compose asks a pass of, this run's alone
 			composes.set(delivery.ComposesOwn)
 			env.Composed, env.SelfComposed, env.Trusted, env.Policy = composer, true, nil, composer.Policy
 			env.HoldsData = composer.HoldsData // what runs from the kept declaration says Data as its manifest does
@@ -692,6 +693,7 @@ func nodeAgent(ctx context.Context, opts options, signer ed25519.PublicKey, trus
 		stopRun()
 		cancel()
 		current.set(nil)
+		composerNow.Store(nil)
 		if ctx.Err() != nil {
 			return
 		}
@@ -814,6 +816,10 @@ func busyModules() []string {
 // (writeHealthReport); nil on a node that does not compose its own, whose parts then name no target.
 var machinesNow atomic.Pointer[selfcompose.Composer]
 
+// composerNow is the composer of the run that composes the node's own now, nil while the node applies the controller's
+// compositions or no run is going: what the verb compose asks a pass of (issue 774).
+var composerNow atomic.Pointer[selfcompose.Composer]
+
 // keptRetired says the kept declaration is read no more: every module the seat's placement puts on this node has a have of
 // its own (placedAllHave), so what runs is the agent's alone (ADR 0550 §2, design 47's L3 s9).
 var keptRetired atomic.Bool