[cschanhniem]

Summary

• ProofLadderLevelCertificate (PLC-): 14 fields, makes proof-ladder level a machine-verifiable structured assertion
• 14 validation rules: PLC- prefix, pipeline_version+candidate_id+certificate_id non-empty, claimed_level 10-value vocab, evidence_type vocab (4), verifier_type vocab (5), verification_date ISO, supporting_artifact_ids non-empty, unsupported_claims non-empty ≤500 chars (anti-overclaim guard), dry_lab_only=True caps at multi_signal_candidate_evidence, levels ≥expert_reviewed_assay_proposal require human_review_required=True, human_review pending warning, notes ≤300 chars
• 3 warnings: single artifact, pending human review, notes empty
• 63 tests; BASELINE 6205→6268
• CLI: openamp-foundry proof-ladder-level-certificate-check
• Implements Phase B B1 — replaces bare string with structured assertion; unsupported_claims field is an explicit anti-overclaim guard