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.

ops/authority/TASKS.completed.md

@@ -0,0 +1,5 @@
+# Completed Tasks
+
+| ID | Status | Owner(s) | Depends on | Description | Exit Criteria |
+| ID | Status | Owner(s) | Depends on | Description | Exit Criteria |
+| OPS3.KEY-ROTATION | DONE (2025-10-12) | DevOps Crew, Authority Core | CORE10.JWKS | Implement key rotation tooling + pipeline hook once rotating JWKS lands. Document SOP and secret handling. | ✅ CLI/script rotates keys + updates JWKS; ✅ Pipeline job documented; ✅ docs/ops runbook updated. |