Give the words' zone through a seam, so no test writes time.Local under the race detector (novox/hq issue 443)

cmd/mesh-controller/delivery_conditions.go

@@ -61,6 +61,10 @@ type waitingCheck struct {
 // wordsNow is the time the words are said at, which says whether a time needs its day; a seam a test replaces.
 var wordsNow = time.Now
 
+// wordsZone is the zone a stalled line's times are said in: the controller's local zone, as every other time in its
+// messages. A seam a test replaces, so that no test writes time.Local, which every goroutine of the package reads.
+var wordsZone = func() *time.Location { return time.Local }
+
 // operatorsOnly is whether the table leaves H2 nothing to do for the line: the state is the operator's.
 func (l stalledLine) operatorsOnly() bool { return l.H2 == "" || strings.HasPrefix(l.H2, "none") }