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Repeatable post-deploy (and periodic) check that proves the books are consistent against real data: per company, Trial Balance debits==credits, Balance Reconciliation shows no drift, then Recalculate Balances and re-check. Includes the read-only pre-deploy migration preview, the two pending migrations in order, account spot-checks for the audit-touched accounts, and the inventory/sales-tax policy reminders. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>