mesh-knowledge: clear a never-reviewed notice once the record moves on, key it by version and run of tries, say times locally (review of #219)

A notice left open kept telling the operator a record was proposed and not in force after it was proposed again
or accepted, and a later version's notice merged into it.

modules/mesh-knowledge/cmd/mesh-knowledge/kit_test.go

@@ -397,7 +397,10 @@ type world struct {
 	router  *router
 	said    *said
 	told    []string
-	clock   time.Time
+	// toldKeys are the keys told under, and cleared what was cleared: key, then its resolved line.
+	toldKeys []string
+	cleared  [][2]string
+	clock    time.Time
 }
 
 func newWorld(t *testing.T, s Store, records Records) *world {
@@ -406,8 +409,12 @@ func newWorld(t *testing.T, s Store, records Records) *world {
 		clock: time.Date(2026, 10, 11, 9, 0, 0, 0, time.UTC)}
 	w.k = &KB{Store: s, Records: records, Reserve: w.tracker.reserve, Judge: w.judge.judge, Asks: w.router,
 		Emit: w.said.emit, Settings: func() (Settings, error) { return Settings{}, nil }, Now: func() time.Time { return w.clock },
-		Logf:   func(f string, a ...any) { t.Logf(f, a...) },
-		Notify: func(key, summary, headline, explanation string) error { w.told = append(w.told, summary); return nil }}
+		Logf: func(f string, a ...any) { t.Logf(f, a...) },
+		Notify: func(key, summary, headline, explanation string) error {
+			w.told, w.toldKeys = append(w.told, summary), append(w.toldKeys, key)
+			return nil
+		},
+		Clear: func(key, resolved string) error { w.cleared = append(w.cleared, [2]string{key, resolved}); return nil }}
 	return w
 }