Page an answer larger than one message of the bus, and keep overviews brief (hq issue 314)

The client library refuses to send a reply over the bus's max_payload, and the
controller only logged it: conditions and status answered nobody for hours on
2026-10-08 while calls said each was answered in 130 ms, and the operator's
channel read nothing. An answer too large is now held under its call and paged
to the caller that asks, on the same subject; a caller that does not page is
told in words, and calls says it. The overviews no longer carry every finding:
conditions and status list each condition with its newest evidence, doctor at
most twenty findings a probe (probe= gives one whole), and the JSON overviews
are sent once, as data, instead of twice.

internal/link/queue.go

@@ -446,8 +446,12 @@ func AskSeatTool(ctx context.Context, conn *nats.Conn, seat, verb, node string,
 	case err != nil:
 		return Answer{}, err
 	}
+	data, err := Whole(ctx, conn, subject, reply.Data)
+	if err != nil {
+		return Answer{}, fmt.Errorf("%s answered %s.%s too large for one message: %w", node, seat, verb, err)
+	}
 	var answer Answer
-	if err := json.Unmarshal(reply.Data, &answer); err != nil {
+	if err := json.Unmarshal(data, &answer); err != nil {
 		return Answer{}, fmt.Errorf("%s answered %s.%s with something unreadable: %w", node, seat, verb, err)
 	}
 	return answer, nil
@@ -527,8 +531,12 @@ func AskMeshSeatTool(ctx context.Context, conn *nats.Conn, seat, verb string, ar
 	case err != nil:
 		return Answer{}, err
 	}
+	data, err := Whole(ctx, conn, subject, reply.Data)
+	if err != nil {
+		return Answer{}, fmt.Errorf("%s answered %s too large for one message: %w", seat, verb, err)
+	}
 	var answer Answer
-	if err := json.Unmarshal(reply.Data, &answer); err != nil {
+	if err := json.Unmarshal(data, &answer); err != nil {
 		return Answer{}, fmt.Errorf("%s answered %s with something unreadable: %w", seat, verb, err)
 	}
 	return answer, nil