{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "required": ["source-contract", "schema-contract", "correctness", "time-semantics", "lineage", "operations", "evidence-receipt-ids"],
  "properties": {
    "source-contract": {"type": "object", "required": ["owner", "version", "freshness-sla"]},
    "schema-contract": {"type": "object", "required": ["grain", "primary-key", "schema-version", "evolution-policy", "null-policy"]},
    "correctness": {"type": "object", "required": ["dedup-key", "idempotency", "reconciliation", "quality-thresholds"]},
    "time-semantics": {"type": "object", "required": ["event-time", "timezone", "late-data-policy", "backfill-policy"]},
    "lineage": {"type": "array", "minItems": 1},
    "operations": {"type": "object", "required": ["rollback", "retry", "alerting", "rpo", "rto"]},
    "evidence-receipt-ids": {"type": "array", "minItems": 1, "items": {"type": "string"}}
  }
}