EnsureConnectedAsync now disposes and nulls any existing non-connected
client before creating a fresh one via _clientFactory.Create().
Previously the method reused a cached client via ConnectAsync, but a
client disposed by a HandleRecycle race or prior teardown would hit
FocasWireClient.ThrowIfDisposed on every subsequent call, leaving the
device permanently wedged with BadCommunicationError and no recovery
path until ReinitializeAsync.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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