G-catalog-B 5: distribution and gitea look at every open transfer at the idle watch's start

A transfer whose idle key ended while the bundle was down was never dropped. Both hand mesh-sdk's
FollowIdle their open transfers, which it gives Expired once the watch is taken.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

modules/distribution/cmd/distribution-tools/main.go

@@ -501,7 +501,7 @@ func main() {
 		Transfers: parts.BusTransfers[holder.Opening](holder.TransfersState), Cap: parts.BusCap(holder.IncomingObjects), Idle: parts.BusArm(holder.IdleState)}
 	v := &holder.Verbs{Holder: h, Catalog: store, Holds: kept[holder.Hold]{state: "holds", key: holder.Hold.Key}, Mirrors: mirrors{}}
 	go followMirrors(v)
-	go parts.FollowIdle(holder.IdleState, h.Expired, func(id string, dropped bool, err error) {
+	go parts.FollowIdle(holder.IdleState, parts.IDs(h.Transfers), h.Expired, func(id string, dropped bool, err error) {
 		if err != nil {
 			logf("%v", err)
 			return