cross-check

Compare two representations of one subject — design and implementation, specification and analysis, reference architecture and code, API documentation and handlers, threat model and deployed controls — on a grid of subject units against comparison facets, classify every cell as agreement, refinement, divergence, or a one-sided gap, and propose a remediation for each discrepancy. Use when the user asks whether the code matches the design, whether a document still describes reality, where two artifacts have drifted apart, or wants a conformance or traceability matrix between a reference and its realization. Do not use for inconsistency among several implementations of one pattern inside a single codebase (realign), for single-sided current-state documentation with no reference artifact (product-map), or for a structural-problem inventory that needs no second side (technical-debt-audit).