Standardized documentation structure for engagements (CC-DATA-01). Capture: entity attributes, initial per-perimeter posture, quarterly measurements (corroboration signals, parametric recall rate, citation coverage, schema entropy rate), L1/L2/L3 verification results, posture forfeiture log, bi-temporal source provenance. Use for: client reporting, longitudinal analysis, causal modeling, proprietary dataset construction. Each record becomes training data for predicting posture outcomes from maintenance patterns. Enables data moat through cumulative dataset quality. Update quarterly throughout engagement.