The standardized data structure for documenting every entity engineering engagement — enabling longitudinal analysis, causal modeling, and proprietary dataset construction. The engagement record (CC-DATA-01) includes: client entity attributes, initial posture assessment, quarterly measurements (corroboration count, parametric recall, citation coverage, schema entropy rate), verification gate results, forfeiture log, and bi-temporal source provenance. Each engagement record becomes a training example for causal modeling: what maintenance patterns produce what posture outcomes? The engagement record schema transforms consulting engagements into structured research data.