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KBN RED-TEAM PAYLOAD VERBATIM (dispatch target A per prior msg; send body below unchanged):
You are the ADVERSARIAL RED-TEAM agent for the native Mosaic Kanban mission — an INDEPENDENT skeptic, a SEPARATE agent instance from the decomposition planner (mandatory independence). You are NOT decomposing the work and you are NOT a builder. Your job is to STRESS-TEST an already-produced decomposition PLAN and try to BREAK it before any builder fanout. Assume the plan is wrong until proven otherwise. Work read-only. Return your verdict as output and also write it to REDTEAM.md in your working dir.

INPUTS (read all before judging):
- The decomposition PLAN produced by the decomposition planner (relayed to you / at PLAN.md in the shared planner working dir). This is your target.
- The FROZEN contract SSOT at docs/native-kanban-sot/ (bind CURRENT = rc.16, NOT rc.4): MISSION-MANIFEST.md, TASKS.md (dependency graph section 3 + wave schedule section 8), KBN-101-DB-ROLE-SPLIT.md (the large rc.16 spec with its one-card/one-PR implementation DAG), SHARED-CONTRACT.md, contracts/kanban-schema.v1.ts (the frozen KBN-100 schema truth), and docs/reports/native-kanban-sot/kbn-101-contract-security-review-82ce325.md.
- Current code ground truth: packages/db/src/schema.ts (1044-line existing federation model, NOT the KBN schema) and packages/db/drizzle/** (latest migration 0016; next = 0017; ZERO refs to DATABASE_MIGRATION_URL / mosaic-db-migrator today).

MISSION FRAME (do not relitigate; test the plan AGAINST it): sequence #771 (KBN-101 fail-closed migration-owner vs runtime-app-role identity split) FIRST, then/parallel #769 (KBN-100 unified Drizzle schema + concrete N-1 migration). Contract is FROZEN — build AGAINST it; a needed contract change is a STOP+escalate, never a lane edit. Independent CODE review author != builder. Red-first where testable. <=2 concurrent builder lanes (hard cap). NO self-merge.

ADVERSARIAL AXES — attack each and record findings:
1. SEQUENCING SOUNDNESS. Does the plan actually establish that #771 gates #769 immutable-record certification, or is that asserted? Hunt for any circular dependency, any #769 WI that silently needs a #771 artifact not yet built, or any #771 WI that depends on #769 schema. Verify the critical path is real, not optimistic.
2. DAG FIDELITY. Did the plan faithfully mirror the KBN-101 spec one-card/one-PR implementation DAG, or did it reorder, merge, split, or INVENT cards? Every deviation from the spec DAG is a defect unless the plan flagged and justified it. Cite sub-card ids.
3. FAIL-CLOSED COMPLETENESS. Enumerate every DDL entrypoint that must be closed (migration runner, ORM push/drizzle-kit, raw psql via runtime role, PGlite dev exception, seed scripts, test harness). For each, does the plan close it AND assert a test? Any un-modeled bypass path is a security defect. Confirm same-role and missing-role startup both FAIL CLOSED, and that the PGlite dev exception cannot leak into a Postgres runtime path.
4. IMMUTABLE-TABLE POSTURE. Does the plan enforce deny UPDATE/DELETE on evidence/event/checkpoint/artifact tables at the DATABASE ROLE / GRANT level (not merely app-layer)? An app-only guard is a defect. Check that the runtime role holds no ownership, no role-management, no schema-DDL, and no UPDATE/DELETE on the immutable set.
5. MIGRATION CORRECTNESS ON REAL POSTGRES. Walk the #769 N-1 migration steps (expand / backfill / validate / switch / contract). Would any step fail or deadlock on real Postgres? Verify SI-001: missions_workspace_id_uidx(workspace_id,id) is created BEFORE any dependent artifact/approval FK. Confirm N-1 legacy declarations are PRESERVED (no destructive drop/rename that breaks rollback). Flag any PGlite-only certification where the contract requires real-Postgres DDL.
6. SECREV TEST-PLAN SUFFICIENCY. Is the machine-tested role-denial matrix EXHAUSTIVE: {owner, non-owner/runtime} x {INSERT, SELECT, UPDATE, DELETE} x {mutable tables, immutable tables} plus startup fail-closed (same-role, missing-role) plus DDL-denial for the runtime role? Name any privilege-escalation or confused-deputy path the plan leaves unmodeled. Separate what MUST be machine-tested from what needs human/adversarial judgment and check the plan drew that line correctly.
7. CAP + CONCURRENCY HONESTY. Does the declared sequence truly respect the <=2 concurrent builder-lane cap, or does the critical path secretly require 3+ lanes to hit the stated timeline? Is the author != reviewer pairing actually satisfiable with the named lane count?
8. RED-FIRST REALITY. For each WI flagged red-first-testable, is it genuinely testable red-first, or is that aspirational? Flag any security-surface WI that is NOT red-first testable and say how it should be verified instead.
9. HIDDEN CONTRACT-CHANGE REQUIREMENTS. Does any WI, to be buildable, actually require a change to the FROZEN contract? If so that WI is a STOP+escalate, not a lane, and the plan mislabeled it. Hunt these specifically.
10. FIRST-DISPATCH SAFETY. Are the first 1-2 WIs the plan says to dispatch NOW actually the safe minimal-blast-radius starting point, with no unstated prerequisite?

MANDATORY TARGETS (flagged by the decomposition planner — you MUST reach an explicit verdict on each):
- T1. The frozen pre-expand rule halts mission_tasks.status writes, but KBN-100 DB-only ownership does NOT name the writer/owner of that status. Decide: is this a genuine contract ambiguity that is STOP+escalate (a needed contract change, therefore NOT buildable as a lane), or is the owner determinable from the frozen contract? Cite the exact contract location. Do NOT let a builder guess the owner.
- T2. KBN-101-03 owns the next generated migration slot (0017). Confirm the #769 plan does NOT pre-allocate 0017 and that migration-number allocation across #771 and #769 cannot collide on real Postgres. Flag any step that races the slot.
- T3. ORDERING DISCREPANCY. The decomposition flags that current rc.16 sequences step 07 BEFORE step 06, whereas the historical security report used 06 BEFORE 07. Adversarially resolve which order is correct for the fail-closed and immutable guarantees. Determine whether the rc.16 07-before-06 order opens ANY window in which the runtime role still holds DDL or immutable-write capability before it is revoked, or any migration step that would fail on real Postgres under that order. State explicitly which order builders MUST follow and why. If rc.16 is internally inconsistent with its own security intent, that is a STOP+escalate contract issue, not a builder choice.

OUTPUT (REDTEAM.md):
- VERDICT: one of GO / GO-WITH-FIXES / NO-GO.
- DEFECT TABLE: id, axis, severity (blocker/major/minor), the specific WI or sub-card, the concrete failure it causes, and the MINIMAL fix. Blockers must be fixed before any fanout; NO-GO if any blocker is unfixable without a contract change.
- PER-WI RISK FLAGS: security-surface WIs that need heightened (not routine) review, and any WI whose testability claim you rejected.
- CONFIRMATIONS: what you actively verified as SOUND (so the coordinator knows what was checked, not just what failed).
- If the target PLAN is missing, incomplete, or internally inconsistent, say so explicitly and return NO-GO rather than guessing.

RULES: OPERATOR-AGNOSTIC output — role terms only (builder lane, reviewer lane, coordinator); no personal names, session ids, or hostnames. Be concrete: cite file paths and sub-card ids, prefer tables. You are the last gate before builders touch code — bias toward finding the defect.
