VERDICT: GO

# Native Kanban/SOT canon independent re-review 2

Independent read-only re-review of the complete updated staged canon. Prior proposal-audit blocker is closed; no KCR-001–016 regression or new blocker found.

## Prior blocker closure

- `contracts/kanban-schema.v1.ts:836-837` declares the required unique `task_events(workspace_id,id)` key before proposal declaration.
- `contracts/kanban-schema.v1.ts:885-894` adds both composite proposal audit FKs—submission and accepted-command event—to that exact workspace-aware key with `RESTRICT`.
- Declaration/migration order is executable and explicit in `SHARED-CONTRACT.md:79-91`: events/key first, proposal table second, both FKs third/fourth, then command enablement. This avoids forward-reference/circular-DDL ambiguity.
- Submission/acceptance semantics are frozen in `SHARED-CONTRACT.md:87-91`: preallocate proposal ID; create exact `change_proposal.submitted` event and proposal in one transaction; on acceptance lock proposal/target, execute the normal command, and bind only a same-workspace/target event with submission causation and `payload.changeProposalId` equal to the locked proposal.
- Required missing, foreign-workspace, unrelated-proposal, unrelated-target, and unrelated-command negatives are explicit in `REQUIREMENTS.md` REQ-SOT-004 and `SHARED-CONTRACT.md:121`; KBN-100/110/140 own migration, service, and integration evidence.

## KCR closure matrix

| KCR                                                    | Status |
| ------------------------------------------------------ | ------ |
| 001 health/proof                                       | CLOSED |
| 002 error discrimination                               | CLOSED |
| 003 approval/assignment binding                        | CLOSED |
| 004 monotonic fencing/composites                       | CLOSED |
| 005 tenant-safe relations                              | CLOSED |
| 006 outage proposal persistence/commands/audit binding | CLOSED |
| 007 dependency/API freeze sequencing                   | CLOSED |
| 008 concrete N-1 map                                   | CLOSED |
| 009 dependency uniqueness                              | CLOSED |
| 010 project congruence                                 | CLOSED |
| 011 immutable audit retention                          | CLOSED |
| 012 retry/quarantine/vocabulary                        | CLOSED |
| 013 archive/tags target semantics                      | CLOSED |
| 014 recovery validator/owner slice                     | CLOSED |
| 015 pure Coordinator split                             | CLOSED |
| 016 health code/state pairing                          | CLOSED |

Fixed invariants remain consistent: PostgreSQL is sole writable SOT; writes require transaction-local proof and fail closed; exports never import sources; notes are attributable proposals only; Coordinator has no scope/gate/certify/merge authority; Certifier has no merge authority.

## Reproducible validation evidence

Executed read-only with current-stack config/toolchain `/src/mosaic-mono-v1`:

```text
./node_modules/.bin/prettier --config /src/mosaic-mono-v1/.prettierrc --check <all 9 publication artifacts>
PASS: All matched files use Prettier code style.

strict TypeScript --noEmit --strict --skipLibCheck --target ES2022 --module NodeNext --moduleResolution NodeNext <four contract copies with current Drizzle node_modules resolution>
PASS

cascade/TODO/TBD/stale-hold grep plus composite-FK/semantic-marker invariant checks
PASS
```

The TypeScript check used a disposable copy under `/home/hermes/agent-work` solely to provide external-file NodeNext dependency resolution; the reviewed staging artifacts were not modified.

## Residual findings

None blocking. Implementation must execute the frozen KBN-100/KBN-110/KBN-140 proposal-event-chain tests and SecReview evidence before feature release, as already required by the canon.

No artifact source repository, branch, PR, or provider state was modified.