Changes to Add capsules to a collection. Answers per item: 200, 207 when some items failed, 400 when all did. An archived capsule refuses the whole request with 409 `CAPSULE_ARCHIVED` naming it in `details.archived`.

added the optional property detail to the response with the 200 status

added the required property failed to the response with the 200 status

added the required property items to the response with the 200 status

added the required property unchanged to the response with the 200 status