{
  "completed_part": 4,
  "state": {
    "legal_custody": "Diệu Linh accepted and sealed Lam Anh lawful copies with witness",
    "investigation": "accepted counsel and preservation framework; no integrity confirmation",
    "technical_findings": "none"
  },
  "next_part": 5,
  "purpose": "Trần Gia Huy receives provider-side read-only telemetry export under independent custody; no findings"
}