{
  "schema_version": "1.0",
  "product": "CASAN",
  "rules": [
    {
      "from": "1.0.x",
      "to": "1.0.x",
      "policy_schema": "1",
      "evidence_pack_schema": "1.0-mvp",
      "rollback": "supported",
      "notes": "Patch-level upgrades only. Back up runtime state and verify the candidate artifact before rollout."
    }
  ],
  "unsupported": [
    "Cross-major upgrades require a reviewed migration entry before deployment.",
    "Downgrades that change policy or Evidence Pack schema are denied until an explicit rollback entry is added."
  ]
}