Complete task 4 backend security architecture docs

Taskmaster/Tasks/task-4-9.md

@@ -1,23 +1,23 @@
 ---
 taskmaster_id: "4.9"
-status: "pending"
+status: "done"
 priority: "medium"
 depends_on: ["8"]
 parent_id: "4"
 source: "taskmaster"
-generated_at: "2026-05-24T07:15:25.199Z"
+generated_at: "2026-05-24T07:26:29.052Z"
 ---
 
 # 4.9 - Create migration and operational runbooks
 
-- [ ] 4.9 - Create migration and operational runbooks #taskmaster #priority/medium #status/pending 🔼 🆔 tm-4-9 ⛔ tm-8
+- [x] 4.9 - Create migration and operational runbooks #taskmaster #priority/medium #status/done 🔼 🆔 tm-4-9 ⛔ tm-8
 
 ## Metadata
 
 | Field | Value |
 | --- | --- |
 | Taskmaster ID | 4.9 |
-| Status | pending |
+| Status | done |
 | Priority | medium |
 | Dependencies | 8 |
 | Parent | 4 - Define backend security and refactor strategy from latest audit |
@@ -28,6 +28,8 @@ Document rollout, rollback, and incident response for the selected backend/funds
 
 ## Details
 
+Completed. Produced `08 - Operations/Backend Funds Migration and Operational Runbooks.md`.
+
 Include SHKeeper legacy read path, provider feature flag, ledger backfill, validation report before enforcement, rollback criteria, webhook cutoff, manual reconciliation, failed webhook, duplicate/missing payment, stuck release, disputed release attempt, compromised admin, leaked API key, provider outage, chain/RPC outage, suspicious payment proof, and npm/package compromise.
 
 ## Verification