The delivery link's own pattern refused the slash and the @ every delivery id
carries, so no delivery could be linked either. Mirror mesh-delivery's IDOf.
The tracker's own pattern refused the slash a delivery's id carries, so no issue
could track a delivery's condition and the operator's alert kept saying no issue
tracks it. Mirror the controller's key rule instead of a pattern of our own; a
router test proves a slashed key is matched and named end to end.
jschoubben