Mark the uplink seat's verbs optional, the one mechanism, and keep every optional verb out of the seat row

Staged duplicated Verb.Optional. Optional, though, was still seeded into the row,
where the mark is not kept: read back, the delivery seat's checks verb and these
would be required of every holder, and an older controller would require them
too. Stored leaves optional verbs out, and the working set takes them from the
compiled seat, still optional.

internal/inventory/seats.go

@@ -62,7 +62,7 @@ func (i *Inventory) Seats(ctx context.Context) ([]catalogue.Seat, error) {
 func (i *Inventory) SeedSeats(ctx context.Context, defaults []catalogue.Seat) (int, error) {
 	var added int
 	for _, s := range defaults {
-		// A verb still staged is never stored (catalogue.Seat.Staged).
+		// An optional verb is never stored (catalogue.Verb.Optional).
 		s = s.Stored()
 		accepts, emits, serves, err := protocolJSON(s)
 		if err != nil {

internal/inventory/seats_test.go

@@ -157,9 +157,10 @@ func TestTheControllersVerbsInTheRowAreTheBinarys(t *testing.T) {
 	}
 }
 
-// A verb still staged (novox/hq ADR 0241) is never in the store's row: a controller older than it reads
-// the row and would require what no holder of its time serves.
-func TestAStagedVerbIsNotSeeded(t *testing.T) {
+// An optional verb (catalogue.Verb.Optional; novox/hq ADR 0241, ADR 0239) is never in the store's row: a
+// controller older than it reads the row and would require what no holder of its time serves, and the mark
+// itself is not stored, so the row would read back required.
+func TestAnOptionalVerbIsNotSeeded(t *testing.T) {
 	inv := ForTest(t)
 	if _, err := inv.SeedSeats(t.Context(), catalogue.DefaultSeats()); err != nil {
 		t.Fatal(err)
@@ -173,8 +174,10 @@ func TestAStagedVerbIsNotSeeded(t *testing.T) {
 		t.Fatal(err)
 	}
 	for _, s := range got {
-		if s.Name == "node-uplink" && len(s.Serves) != 0 {
-			t.Fatalf("the row keeps %v", s.Serves)
+		for _, v := range s.Serves {
+			if (s.Name == "node-uplink") || (s.Name == catalogue.DeliverySeat && v.Name == "checks") {
+				t.Fatalf("%s's row keeps the optional %s", s.Name, v.Name)
+			}
 		}
 	}
 }