`kafka_dae_control`: alarms

Implement PV alarm fields and propagate failures to read from hardware into the EPICS alarm statuses.

Start by locating the kafka_dae_control entry point and its existing PV fields and hardware-read path. Trace how read failures are currently handled, then identify the EPICS alarm statuses that must reflect those failures. Done means the PV alarm fields are implemented and hardware read failures propagate into the EPICS alarm statuses; no tests or file paths are named in the issue.

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