docs(#753): start KBN-010 threat gate

docs/scratchpads/753-kbn010-threat-gate.md

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+# 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.