Status: IN
The notification system achieves delivery completeness when bounded delivery (double rate checks, retry escalation), strict rendering (fail-fast on missing templates/variables), and stable ordering (deterministic priority queue) all function correctly — unless the unused group-key infrastructure signals an incomplete aggregation feature needed for batch delivery scenarios.
delivery, rendering, and ordering form a complete pipeline; the vestigial group-key code suggests a missing aggregation layer
Depends on (SL): notification-delivery-is-bounded, notif-template-rendering-strict, notif-priority-heap-stable
Unless: notif-group-key-unused