Judge loss by arrival order and a deadline, one tx ring per stream

phy.go

@@ -535,6 +535,10 @@ func (c *cableDiag) kick(done *atomic.Bool) bool {
 			}
 		}
 		c.mu.Unlock()
+		// The judge can charge a masked-era loss up to one deadline after the
+		// wire went quiet, so the mask outlives the measure by that window —
+		// universally, rather than each source tracking its own tail.
+		time.Sleep(lossDeadline)
 		c.masked.Store(false)
 	}()
 	return true