governance(acv2): authorize combined Schema 23 canonical migration closure

[laiqian0239-glitch]

Work package

ACV2-SCHEMA23-CANONICAL-MIGRATION-COMBINED-CLOSURE-V2

Fresh-main combined successor that resolves the real merge-order deadlock between PR #374's Schema 23 migration and #375's base-owned stale current-schema test contract.

Why a combined successor is required

• SUPERSEDED — fix(acv2): canonicalize durable projection-job migration ownership #374 exact Head ca72110604296a1a9ca3952757fc2ff24b779616 has a real Schema 23 migration GREEN locally, but ACV2 CI is RED because base-owned tests still hard-code current total schema 22.
• governance(acv2): authorize Schema 23 current-schema test contract closure #375 ordinary-merged authorization bccd3145a4e885026414d50d61ad31121bdea709 permits correcting those two tests, but a test-only implementation expecting current schema 23 cannot merge before the production migration exists.
• Neither side may legally merge first without bypassing a real RED.

This successor therefore combines only the already-audited five exact paths into one atomic failure-first work package.

Exact implementation scope

Five paths, SHA-256 787a88f19855e80d316d03622857d53f2fd654c4b50cd1641bc845b6d6a9edd8:

• backend/lib/r32SqliteStore.js
• backend/migrations/architectureClosureV2DomainEventProjectionJobsCanonical.js
• backend/tests/architectureClosureV2/wpA/authorityWriteHost.test.js
• backend/tests/architectureClosureV2/wpA/domainEventProjectionJobsCanonicalMigration.test.js
• backend/tests/batch27DeveloperHandoffV2Closure.test.js

Mandatory first implementation commit is test-only on exactly the three test paths, SHA-256 fbda331336c0f09da7579f29a443b0de85fb573f3ccecd7983c09b11dde4725c, and must establish a fresh combined causal RED from current trusted main.

The GREEN descendant may add only the two production paths already independently reviewed on #374.

Historical boundary

Historical Schema 22 migration identity, target and receipt remain exactly 22. schema22PostMergeIntegrityMigration.test.js is explicitly out of scope. Current total R32 schema advances to 23 only with the new forward migration.

No dependencies, workflows, package/lock files, projection worker changes, history rewrites, rebase, cherry-pick-as-authority, release, publish or gate weakening.

Learned Policy isolation

PR #372 remains frozen at fb1beeb0e39ad4d6263f71b4c995eb5ec663e6e2 until this combined closure ordinary-merges.

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Reviewing files that changed from the base of the PR and between bccd314 and 3b9bd8a.

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• governance/layered-ci/acv2-schema23-canonical-migration-combined-v2-authorization.json

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