Walk a stopped walk's merges again in the open batch, in one act, and say what stays on the machines (review of #232, hq issue 459)

A new batch beside the open one walked an older commit after a newer one, and a
stop that failed partway could leave a merge on two plans. A module shared with
the stopped merge, built at its branch, would deliver it; it is left out or
withheld. A batch not yet cut can drop a merge, so mesh-delivery can stop a
merge walked again. The stopped walk names what it left on which machines.

internal/catalogue/verbs.go

@@ -161,9 +161,11 @@ var ControllerVerbs = []Verb{
 			[]string{"plan"})},
 	{Name: "delivery-stop", Description: "End a walk on its delivery's word (novox/hq ADR 0239): failed, said as stopped " +
 		"by whom and why; what it asked still builds and registers, nothing further is asked or sent. Given merges to " +
-		"leave out, every other merge the walk answered is walked again in a fresh batch without them and without each " +
-		"later merge of their repository, which contains one and is left out too, named (novox/hq ADR 0299); the " +
-		"answer names the batch, the merges walked again and the merges left out.",
+		"leave out, every other merge the walk answered is walked again — in the open batch of its kind, or a new one — " +
+		"without them, without each later merge of their repository, which contains one, and without each merge moving " +
+		"a module one moves, each left out too and named (novox/hq ADR 0299); a batch not yet cut drops the merges. The " +
+		"answer names the batch, the merges walked again, the merges left out, the modules the stopped walk sent that " +
+		"stay on their machines, and the merges elsewhere that will still deliver a stopped change.",
 		Input: schema(map[string]string{"plan": "the walk's id", "why": "why", "by": "who stopped the delivery",
 			"without": "merges to leave out, <repository>@<commit>, comma-separated"},
 			[]string{"plan", "why"})},