Say once after a restart that nothing waits, so an old retirement condition clears (issue 937)

The controller clears a provider's retire-waiting condition only on its
settled word, and a provider says settled only for a set its own memory
held. A provider restarted after the set stopped waiting (here: the
delivery of the grant-file fix) never says it, so the condition kept
asking the operator to approve retiring what nobody waits on. The first
pass of a process that finds every consumer asked now says settled once,
with no set; the controller clears both conditions on it.

modules/postgres/cmd/postgres-provider/standing_test.go

@@ -21,8 +21,10 @@ func standingWorld(t *testing.T) (*world, *[]announced) {
 	w := newWorld(t)
 	var said []announced
 	w.h.Announce = func(e string, b map[string]any) {
-		// The first success since start is its own test's; every other test reads past it.
-		if b["why"] != "first-success" {
+		// The first success since start, and the first word that nothing waits (issue 937), are their own
+		// tests'; every other test reads past them.
+		if c, _ := b["consumers"].([]map[string]any); b["why"] != "first-success" &&
+			!(e == EventRetirement && b["change"] == ChangeSettled && len(c) == 0) {
 			said = append(said, announced{e, b})
 		}
 	}
@@ -178,7 +180,11 @@ func (classing) Class(error) string { return "its-own" }
 func TestTheFirstSuccessSinceStartIsAnnouncedOnce(t *testing.T) {
 	w := newWorld(t)
 	var said []announced
-	w.h.Announce = func(e string, b map[string]any) { said = append(said, announced{e, b}) }
+	w.h.Announce = func(e string, b map[string]any) {
+		if e != EventRetirement {
+			said = append(said, announced{e, b})
+		}
+	}
 	w.give(map[string]any{"as": "a"})
 	w.passes(3 * time.Minute)
 	if events(said) != EventRecovered || said[0].body["why"] != "first-success" || said[0].body["consumer"] != "a" {