fix(opcuaclient): upstream session loss goes Bad and recovers (#670)

A bad keep-alive now degrades health (LastSuccessfulRead preserved) and,
once per outage, publishes BadNoCommunication (value retained) for every
subscribed ref plus a quality-only annotation on subscribed alarm
conditions. Good keep-alives and data/event notifications advance
LastSuccessfulRead, so an idle-but-alive subscription never looks dead
to the #527 watchdog. A keep-alive that recovers on the same session
re-reads the Bad refs and republishes them Good; a session that does not
come back is recovered by the watchdog's ShutdownAsync + InitializeAsync
+ re-subscribe.

Deletes the SessionReconnectHandler wiring (it retried forever in SDK
1.5.378, cloned subscriptions the driver never re-tracked and kept health
Healthy), OnReconnectComplete, TryRearmReconnect and the reconnect_*
counters (new keepalive_recovered). Teardown of a lost session skips
wire deletes and bounds CloseSession. SDK warnings reach the driver log.
Wire test reworked: restart => Bad, then watchdog-style reinit => Good.

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DriverInstanceActor.cs

@@ -579,8 +579,8 @@ public sealed class DriverInstanceActor : ReceiveActor, IWithTimers
     ///     came back — live-confirmed against a stopped Modbus fixture, which needed a node restart. Both
     ///     comms-loss quality paths (#477 native conditions, #481 scripted-alarm inputs) hang off
     ///     <see cref="ConnectivityChanged"/>, so both were wired to a signal that never fired.
-    ///     <c>OpcUaClientDriver</c>'s own reconnect-exhausted branch already assumed this mechanism existed
-    ///     ("the Core never learns it must offer an operator reinitialize") — it did not.
+    ///     Since Gitea #670 this is also <c>OpcUaClientDriver</c>'s only recovery path for a lost upstream
+    ///     session (its in-driver SDK reconnect handler was deleted).
     ///     </para>
     ///     <para>
     ///     <b>Why the trip condition is a conjunction, and NOT simply "non-Healthy for N polls".</b>