OmniRig: on the IC-7610 the generic Freq property reports the wrong VFO (its
Main/Sub model confuses the stock ini), so OpsLog showed VFO B. Detect the rig
by RigType and, in simplex, read VFO A explicitly — matching Log4OM. Only the
7610 is affected; other rigs keep using the generic Freq.
Icom network: when the rig tears the session down (control/CI-V 0x05) OpsLog
only logged it and kept the half-dead link until the 6 s liveness timeout
expired. Mark the link dead on 0x05 so Alive() fails on the next poll and the
manager reconnects cleanly right away.