diff --git a/docs/native-kanban-sot/TASKS.md b/docs/native-kanban-sot/TASKS.md
index c0e10ef..d868545 100644
--- a/docs/native-kanban-sot/TASKS.md
+++ b/docs/native-kanban-sot/TASKS.md
@@ -70,19 +70,21 @@ No consumer implementation begins before KBN-105. No schema work begins before K
 
 ### KBN-000 — Remediate and publish canon
 
-- **Owner:** Mos / publication control plane.
-- **Mode:** SERIAL; publication gate in progress.
+- **Status:** COMPLETE — PR #752 squash-merged as `49e8a54`; issue #751 closed; post-merge pipeline #1798 terminal success.
+- **Owner:** Mosaic publication control plane.
+- **Mode:** SERIAL; completed.
 - **IN:** Resolve KCR-001–016 in requirements, schema, health, Coordinator, recovery, migration map, and slices; independent re-review.
 - **OUT:** Feature implementation.
 - **Depends on:** none.
 - **Contract surfaces:** all canon.
-- **Evidence:** strict TS; Prettier; per-finding traceability; independent author≠reviewer GO.
+- **Evidence:** strict TS; Prettier; per-finding traceability; independent author≠reviewer GO; Ultron GO; terminal-green CI.
 
 ### KBN-010 — Threat, authorization, and constraint-impact gate
 
-- **Owner:** coder3; independent `secrev`.
+- **Status:** IN PROGRESS — issue [#753](https://git.mosaicstack.dev/mosaicstack/stack/issues/753).
+- **Owner:** `kbn-coder3`; independent `secrev`.
 - **Mode:** SERIAL prerequisite of KBN-100.
-- **Exclusive files:** Mos-selected threat/auth docs only.
+- **Exclusive files:** `docs/native-kanban-sot/KBN-010-THREAT-AUTH-CONSTRAINT-GATE.md` and task scratchpad only.
 - **IN:** Cross-workspace owners/principals/evidence; active membership; stale/forged health; approval forgery; fence monotonicity; audit retention; proposal target/audit-event forgery; service tokens; DB/Valkey outage.
 - **OUT:** Runtime/schema edits.
 - **Depends on:** KBN-000 independent re-review GO.
diff --git a/docs/scratchpads/753-kbn010-threat-gate.md b/docs/scratchpads/753-kbn010-threat-gate.md
new file mode 100644
index 0000000..b1f4df1
--- /dev/null
+++ b/docs/scratchpads/753-kbn010-threat-gate.md
@@ -0,0 +1,30 @@
+# Issue #753 — KBN-010 threat, authorization, and constraint-impact gate
+
+## Objective
+
+Complete the mandatory threat/auth/constraint-impact analysis that gates KBN-100 schema implementation.
+
+## Scope
+
+- In: threat matrix, frozen-control mapping, schema/API/test impact inventory, security evidence plan.
+- Out: runtime, schema, migration, API, dependency, CI, deployment, and secret changes.
+- Canonical requirements: `docs/requirements/native-kanban-sot.md`.
+- Frozen contract: `docs/native-kanban-sot/SHARED-CONTRACT.md` and `contracts/*.v1.ts`.
+- Tracking: Mosaic Stack issue #753.
+
+## Plan
+
+1. Independently inspect current-main implementation and frozen canon.
+2. Enumerate tenant, identity, health-proof, approval, fencing, proposal, audit, token, and outage threats.
+3. Map every threat to required constraints, command behavior, negative tests, and owning future slice.
+4. Surface any unresolved schema impact as a blocker; do not silently amend the frozen contract.
+5. Run documentation/static validation and submit for independent SecReview.
+
+## Execution log
+
+- 2026-07-14: KBN-000 completed through PR #752 and post-merge pipeline #1798.
+- 2026-07-14: KBN-010 issue #753 created; task marked in progress; fresh GPT worker pending dispatch.
+
+## Verification evidence
+
+Pending worker validation, independent SecReview, Ultron gate, PR merge, post-merge CI, and issue closure.