The reconciliation API specs make it possible to specify a type for entities returned as reconciliation candidates:
https://reconciliation-api.github.io/specs/latest/#reconciliation-query-responses

Providing one will make the user experience better for users, since they will see a single type being suggested when they open the reconciliation dialog.

We could just pick a type and its identifier that would be applied to all entities returned by the reconciliation.

For instance, instead of simply returning reconciliation candidates like

{
   "id": "M74698470",
   "match": true,
   "name": "File:Chick Corea & Stanley Clarke.jpg",
   "score": 100
}

we should return

{
   "id": "M74698470",
   "match": true,
   "name": "File:Chick Corea & Stanley Clarke.jpg",
   "score": 100,
   "type": [
       {
          "id": "mediafile",
          "name": "Media file"
       }
   ]
}