Mark a rerun check with a short (run N) after its verdict, and word a re-hand-out neutrally

The forge clips a status to 140 characters, so the long sentence pushed the
verdict's own words out; and a paused holder's hand-back or a bus delay also
count as a delivery, so the cause is not claimed (novox/hq issue 594).

internal/link/builds.go

@@ -98,14 +98,25 @@ type BuildStart struct {
 	Delivery int `json:"delivery,omitempty"`
 }
 
-// Restarted is how a build handed out again says so (novox/hq issue 594): in its log, in the queue and on
-// the pull request its check answers, so a second run never reads as the first. Empty for a first start.
+// Restarted is how a build handed out again says so (novox/hq issue 594), in its log and in its check's
+// report, so a second run never reads as the first. Neutral on why: a holder replaced mid-build, a paused
+// holder handing an ask back as it arrived, and a bus that held its acknowledgements past the wait all
+// count as a hand-out. Empty for a first start.
 func Restarted(delivery int) string {
 	if delivery < 2 {
 		return ""
 	}
-	return fmt.Sprintf("restarted: handed out %d times — an earlier build agent took it and did not finish, "+
-		"most often because it was replaced mid-build, so it ran again from the start", delivery)
+	return fmt.Sprintf("restarted: handed out %d times; an earlier hand-out did not finish here, so this run "+
+		"started from the beginning", delivery)
+}
+
+// RunMarker is the short form of Restarted, for a line clipped to a few words — a check's status on the
+// forge (novox/hq issue 594): "(run 2)". Empty for a first start.
+func RunMarker(delivery int) string {
+	if delivery < 2 {
+		return ""
+	}
+	return fmt.Sprintf("(run %d)", delivery)
 }
 
 // BuildLine is one thing a build said while building.