feat: Document completed tasks across multiple components

- Added completed tasks documentation for Scheduler WebService, ImpactIndex, Models, Queue, Storage.Mongo, Worker, Signals, Signer, UI, Zastava.Observer, Zastava.Webhook, Zastava.Core, Cryptography.Kms, Cryptography, and Plugin.
- Each task includes ID, status, owners, dependencies, descriptions, and exit criteria to ensure clarity and traceability.
- Enhanced integration and unit testing coverage across various components to validate functionality and compliance with specifications.

docs/notifications/overview.md

@@ -55,7 +55,7 @@ The Notify WebService fronts worker state with REST APIs used by the UI and CLI.
 | Step | Goal | Reference |
 |------|------|-----------|
 | 1 | Deploy Notify WebService + Worker with Mongo and Redis | [`modules/notify/architecture.md`](../modules/notify/architecture.md#1-runtime-shape--projects) |
-| 2 | Register OAuth clients/scopes in Authority | [`etc/authority.yaml.sample`](../etc/authority.yaml.sample) |
+| 2 | Register OAuth clients/scopes in Authority | [`etc/authority.yaml.sample`](../../etc/authority.yaml.sample) |
 | 3 | Install channel plug-ins and capture secret references | [`plugins/notify`](../../plugins) |
 | 4 | Create a tenant rule and test preview | [`POST /channels/{id}/test`](../modules/notify/architecture.md#8-external-apis-webservice) |
 | 5 | Inspect deliveries and digests | `/api/v1/notify/deliveries`, `/api/v1/notify/digests` |