Carbon Ledger as CO2e accounting
Most platforms treat CO2e as an annual report calculated via spreadsheet. In NexLog OS, CO2e is an accounting unit: each physical movement (`movements`), each shipment (`shipments`), each order (`orders`) generates an entry (`carbonEntries`) — emission or offset — with double-entry and audit trail. Credits (`carbonCredits`) back compensations and live in the same ledger. This enables on-demand reports, CBAM-ready, with SKU-level depth.