Merge mesh-delivery's trunk (the checker release #161) into the registry group

The group's beside.go and pins_test.go already carry #161's fixes in their
group form (siblings from each sibling's go.mod); try_test.go keeps #161's
case that echoes the end through Put, in the group's event types.

Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i

modules/mesh-delivery-checker/internal/check/try_test.go

@@ -193,7 +193,19 @@ func TestATryIsJudgedAsAGroupsCheckAndOwesTheForgeNothing(t *testing.T) { // ADR
 	var waiting string
 	cands.during = func() { waiting = readTry(t, kv, id).Waiting } // ADR 0639 §5: the stored try says what it waits for
 	var said []string
-	tr := &Tryer{Tries: written, Judge: b.ex, Say: func(_ context.Context, event string, e checkermsg.Event) error {
+	var tr *Tryer
+	echoed := false
+	tr = &Tryer{Tries: written, Judge: b.ex, Say: func(ctx context.Context, event string, e checkermsg.Event) error {
+		if event == checkermsg.Ended && !echoed {
+			// The end the run wrote comes back on the key's watch while the run says it: Put stops the run's context and
+			// leaves the saying to the run, whose say must not be stopped with it (issue 1921).
+			echoed = true
+			raw, _, _, _ := kv.Get(context.Background(), id)
+			tr.Put(context.Background(), id, raw)
+		}
+		if err := ctx.Err(); err != nil {
+			return err // a publish on a stopped context is never acknowledged
+		}
 		said = append(said, fmt.Sprintf("%s %s %d %s", event, e.ID, len(e.Members), e.State))
 		return nil
 	}}