[cschanhniem]

Summary

• CalibrationImprovementRecord: 12 fields, before/after audit record for calibration updates
• 11 validation rules: CIR- prefix, pipeline_version non-empty, calibration_version_before/after non-empty and must differ, ISO date, metric_name vocab (8: auroc/auprc/brier_score/calibration_error/precision_at_k/recall_at_k/f1_at_threshold/expected_calibration_error), improvement_confirmed=True enforced, rationale non-empty and ≤400 chars, data_source_id non-empty, notes ≤300 chars
• 3 warnings: wrong metric direction (higher-is-better/lower-is-better), very small improvement (<0.005), notes empty
• 63 tests; BASELINE 5729->5792
• CLI: openamp-foundry calibration-improvement-record-check
• Completes Phase O: CIR- joins O1/O2/O4/O5 with the missing before/after change record