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.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests/OpcUaClientDiagnosticsTests.cs

@@ -57,9 +57,7 @@ public sealed class OpcUaClientDiagnosticsTests
         d.Record(OpcUaClientDiagnostics.BadStatusValue);
         d.Record(OpcUaClientDiagnostics.PublishError);
         d.Record(OpcUaClientDiagnostics.KeepAliveMiss);
-        d.Record(OpcUaClientDiagnostics.ReconnectAttempt);
-        d.Record(OpcUaClientDiagnostics.ReconnectSuccess);
-        d.Record(OpcUaClientDiagnostics.ReconnectExhausted);
+        d.Record(OpcUaClientDiagnostics.KeepAliveRecovered);
 
         cap[OpcUaClientDiagnostics.PublishResponse].ShouldBe(1);
         cap[OpcUaClientDiagnostics.Notification].ShouldBe(3);
@@ -67,9 +65,7 @@ public sealed class OpcUaClientDiagnosticsTests
         cap[OpcUaClientDiagnostics.BadStatusValue].ShouldBe(1);
         cap[OpcUaClientDiagnostics.PublishError].ShouldBe(1);
         cap[OpcUaClientDiagnostics.KeepAliveMiss].ShouldBe(1);
-        cap[OpcUaClientDiagnostics.ReconnectAttempt].ShouldBe(1);
-        cap[OpcUaClientDiagnostics.ReconnectSuccess].ShouldBe(1);
-        cap[OpcUaClientDiagnostics.ReconnectExhausted].ShouldBe(1);
+        cap[OpcUaClientDiagnostics.KeepAliveRecovered].ShouldBe(1);
     }
 
     [Fact]