{
  "artifact": "retrieval-source-owner-map",
  "tiers": {
    "critical": { "reviewEveryDays": 30, "ownerRequired": true, "escalateAfterDays": 5 },
    "standard": { "reviewEveryDays": 90, "ownerRequired": true, "escalateAfterDays": 15 },
    "reference": { "reviewEveryDays": 180, "ownerRequired": true, "escalateAfterDays": 30 }
  },
  "gate": "Critical sources cannot remain active without owner, freshness window, permission model, and citation rule."
}