Reference relay server for Aegis.
GET /healthzPOST /v1/envelopesGET /v1/envelopes/:recipient_id
POST /v1/envelopesacceptsStoreEnvelopeRequestJSON fromaegis-api-typesand persists the embeddedEnvelope.GET /v1/envelopes/:recipient_idreturnsFetchEnvelopeResponseJSON fromaegis-api-types.aegit relay fetch --out <dir>can materialize that response into individual envelope files for local opening withaegit msg open.