{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "hms/schemas/ipc/envelope_v1.schema.json",
  "title": "HMS IPC Envelope v1",
  "description": "PLAN.md §6.2: Jede IPC-Nachricht besitzt mindestens diese Felder.",
  "type": "object",
  "required": ["protocol_version", "message_id", "type", "revision", "monotonic_timestamp_ns", "payload"],
  "properties": {
    "protocol_version": {"const": 1},
    "message_id": {"type": "string", "format": "uuid"},
    "type": {"enum": ["command", "event", "snapshot", "ack", "error", "telemetry"]},
    "revision": {"type": "integer", "minimum": 0},
    "monotonic_timestamp_ns": {"type": "integer", "minimum": 0},
    "payload": {"type": "object"},
    "idempotency_key": {"type": "string"}
  },
  "additionalProperties": false
}