Publish a catalogue Variant revision

Makes an approved revision the one new try-ons render. expected_generation is the generation you read; any other answers 409 GENERATION_CONFLICT and moves nothing. Publishing an earlier approved revision is rollback. A revision that is not approved answers 409 REVISION_NOT_APPROVED; a retired variant 409 VARIANT_RETIRED. Publishing the active revision at the current generation answers the variant unchanged. Send an Idempotency-Key: a retry with the same key and the same request answers the first response, byte for byte, with Idempotency-Replayed: true, so a response you did not receive is safe to retry. Requires the catalogue.publish scope, which your account operator provisions; no other catalogue scope implies it. Served only where the catalogue is enabled for your environment.