MxCommandReply.payload has no by-name ack case: MX_COMMAND_KIND_ACKNOWLEDGE_
ALARM_BY_NAME reuses the acknowledge_alarm reply payload. Verified the worker
(MxAccessCommandExecutor.ExecuteAcknowledgeAlarmByName) and gateway
(WorkerAlarmRpcDispatcher) already implement this correctly — the gap was
purely undocumented contract asymmetry. Documented the reuse on the proto
oneof case and the AcknowledgeAlarmReplyPayload message comment (regenerating
the .NET contract), and in docs/AlarmClientDiscovery.md. Added
ProtobufContractRoundTripTests.MxCommandReply_AcknowledgeAlarmByName_Reuses
AcknowledgeAlarmPayloadCase to pin the contract.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Joseph Doherty
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