Mark times optional on the delivery seat until mesh-delivery serves it (hq ADR 0282, design 33 §7)

internal/catalogue/delivery_seat.go

@@ -18,12 +18,15 @@ func deliveryVerbs() []Verb {
 			Input: schema(map[string]string{"state": "one state, e.g. delivering or held",
 				"repository": "owner/repository", "group": "a group's id (its branch name)",
 				"all": "\"true\": the final ones of the last thirty days too"}, nil, "all")},
-		// Delivery time against the delivery budgets (novox/hq ADR 0282): what probe D16 reads.
+		// Delivery time against the delivery budgets (novox/hq ADR 0282): what probe D16 reads, optional until its
+		// holder serves it.
 		{Name: "times", Description: "Delivery time: from a merge to every machine of its walk running the build. " +
 			"Each class's delivery budget (a leaf module five minutes, a core module ten), the last days' median and " +
 			"worst, how many within and over, the newest delivery of each class, every delivery over its budget with its " +
 			"longest phase, and the delivered ones whose time is not known. Given a delivery's id, its time phase by phase.",
-			Input: schema(map[string]string{"days": "how many days back (default 7)", "id": "one delivery's id: its phases"}, nil)},
+			Input: schema(map[string]string{"days": "how many days back (default 7)", "id": "one delivery's id: its phases"}, nil),
+			// Optional until mesh-delivery serves it: its holder lives in the catalogue (design 33 §7).
+			Optional: true},
 		{Name: "show", Description: "One delivery or group whole: its delivery plan (what it builds, what each " +
 			"machine receives, what is not an ordinary send), every transition with when and why, the machine " +
 			"steps of its walk, its group and its order.",