Keep what a consumer gives up on until a person delivers it again or drops it

Design 25 promised a dead-letter stream that did not exist: a message a
consumer gave up on stayed only in its source, which drops it after a week,
and its condition cleared when the advisories stopped (hq issue 330, ADR 0264).

cmd/mesh-controller/plain_words.go

@@ -544,9 +544,11 @@ var plainWordings = map[string]func(conditions.Observation) words{
 			Resolved:    "The listener keeps up again"}
 	}),
 	"max-deliveries": worded(func(o conditions.Observation) words {
-		return words{Headline: "A message could not be handled",
-			Explanation: "The bus gave up on a message after trying to hand it over too many times.",
-			Resolved:    "Resolved: messages are handled again"}
+		return words{Headline: "A listener gave up on messages",
+			Needs: "deliver them again or drop them, from the mesh MCP server.",
+			Explanation: "A listener on the bus could not handle messages after several tries, so what they asked " +
+				"for was not done. The mesh keeps them until you deliver them again or drop them.",
+			Resolved: "Resolved: the messages given up on were delivered again or dropped"}
 	}),
 	"refused": worded(func(o conditions.Observation) words {
 		return words{Headline: "The bus refuses some messages",