Concordia v0.5.x preserved predicate as an attestation reference slot. v0.6 adds the signed predicate artifact behind that slot without changing existing predicate references.
New v0.6 predicates write:
{"type": "urn:concordia:predicate-type:authority_gate:v1"}
Draft artifacts that used predicate_type remain readable only when type is absent. Emitters should migrate to type; write-side validation rejects predicate_type.
references[] continue to use the attestation reference shape:
{"type": "predicate", "id": "urn:concordia:predicate:pred_001", "relationship": "references"}
Readers preserve unknown reference types and relationships as opaque strings for forward compatibility.
condition.result is now gated by predicate type profiles. Deterministic profiles such as authority_gate, procurement_eligibility, and policy_gate may include result. Non-deterministic types must carry runtime evaluation results outside the signed predicate.