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/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient/SdkTelemetry.cs

@@ -1,16 +1,35 @@
+using Microsoft.Extensions.Logging;
 using Opc.Ua;
 
 namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient;
 
 /// <summary>
-///     The one <see cref="ITelemetryContext" /> the driver hands the SDK's non-obsolete (telemetry-taking)
-///     overloads. An empty builder keeps SDK internals off any logging provider (mirrors Client.Shared's
-///     <c>ClientTelemetry</c>).
+///     The <see cref="ITelemetryContext" /> the driver hands the SDK's non-obsolete (telemetry-taking)
+///     overloads. <see cref="Context"/> has no logging provider (static helpers and tests);
+///     <see cref="ForLogger"/> routes the SDK's own Warning-and-above output (keep-alive, publish and
+///     channel errors) to a driver instance's logger — without it every SDK-side session error was
+///     invisible (Gitea #670).
 /// </summary>
 internal static class SdkTelemetry
 {
     private static readonly Lazy<ITelemetryContext> Instance = new(() => DefaultTelemetry.Create(_ => { }));
 
-    /// <summary>Gets the shared telemetry context.</summary>
+    /// <summary>Gets the shared, provider-less telemetry context.</summary>
     public static ITelemetryContext Context => Instance.Value;
+
+    /// <summary>Creates a telemetry context whose SDK log output at Warning and above goes to <paramref name="logger"/>.</summary>
+    /// <param name="logger">The driver instance's logger.</param>
+    /// <returns>The telemetry context.</returns>
+    public static ITelemetryContext ForLogger(ILogger logger) =>
+        DefaultTelemetry.Create(builder => builder
+            .SetMinimumLevel(LogLevel.Warning)
+            .AddProvider(new ForwardingLoggerProvider(logger)));
+
+    /// <summary>Hands every SDK logger category the one driver logger.</summary>
+    private sealed class ForwardingLoggerProvider(ILogger target) : ILoggerProvider
+    {
+        public ILogger CreateLogger(string categoryName) => target;
+
+        public void Dispose() { }
+    }
 }