{
  "kind": "callback_request",
  "expect": "invalid",
  "expect_error": "schema_version mismatch",
  "description": "stale schema_version must be rejected by validate()",
  "data": {
    "schema_version": "lifeloop.v0",
    "event": "session.starting",
    "event_id": "evt-1",
    "adapter_id": "codex",
    "adapter_version": "0.1.0",
    "integration_mode": "native_hook",
    "invocation_id": "inv-1"
  }
}
