feat(ADM-018): completed feature

work/artifacts/F-024/documenter.md

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+# Documenter — F-024 Notifications: transactional email
+
+## Summary
+Notifications module dispatches transactional emails through an EmailProvider port. event_id is the idempotency key for retries. Provider implementations live in infrastructure.
+
+## Public API notes
+
+| Route | Access | Result |
+|---|---|---|
+| POST /notifications/dispatch | admin | Records message and triggers provider.send |
+| GET /notifications/messages/:eventId | admin | Returns stored message status |
+
+## Templates
+- `order_confirmation`
+- `payment_failed`
+- `order_shipped`
+
+## Errors
+- `NOT_FOUND` — HTTP 404 when querying unknown event_id
+
+## Evidence
+- `work/artifacts/F-024/architect.md`
+- `work/artifacts/F-024/implementer.md`
+- `work/artifacts/F-024/reviewer.json`
+- `work/artifacts/F-024/security.json`
+- `work/artifacts/F-024/qa.json`