Roebuck's Law 0: The Bounded Ledger

This corrected methods preprint states the controlling ledger for bounded engineering claims involving sustained transport, temperature control, storage, thrust, spectral manipulation, and maintained nonequilibrium order. Version 2 separates control-volume balances from isolated-supersystem conservation, adds explicit mass/species and exergy closure, removes a mixed-unit minimum-power expression, and replaces broad symmetry and biological-theorem claims with explicit domains and testable accounting requirements. No new conservation principle or experimental device validation is claimed. Law 0 controls the accounting framework for Laws 1-8 but does not validate their constitutive models or evidence.