This record contains the canonical reference code library for Conditional Unlocking Fields (CUF).It provides the frozen CUF core operator, canonical measurement stack, constraint library, ledger library, and executable harness examples. The purpose of this library is to ensure that simulations and tests claiming to use CUF are measuring CUF quantities exactly as defined by CUF mathematics, rather than substituting generic statistical or dynamical metrics. The library enforces:• pre-ledger measurement of constraint violation• minimal-correction admissibility ledgers• termination on admissibility failure• CVaR-based stabilization burden• identity-lock threshold extraction• normalized burden and invariance testing Users may substitute their own update rules, constraints, and ledgers via the provided interfaces, but the CUF measurement channel and ordering remain fixed. This record functions as the canonical CUF coding standard for reproducible CUF experiments across domains (dynamical systems, learning algorithms, control systems, and other constrained-update models).