feat(opcuaclient): #676 follow-ups — endpoint rewrite, stall wire test, fast definitive-loss recovery

- Endpoint rewrite: the driver now connects to the configured host AND port (scheme
  match, advertised path kept) instead of the server-advertised URL — fixes NAT/port-map
  upstreams and lets an in-test proxy carry the session (SDK SelectEndpoint rule).
- TcpStallProxy + OpcUaClientDriverStallWireTests: the in-place blip (#670) is now
  wire-tested on loopback — one Bad, frozen read stamp, same session, identical value
  republished Good, a post-recovery change arrives, no source-time regression after
  the SDK's late backlog flush.
- Defect found by that test, fixed: a change published right after a stall rode a
  Publish response the SDK timed out and never republished, leaving the node Good on
  the pre-change value indefinitely. New trailing reconcile read (Timeout +
  KeepAliveInterval after recovery) publishes any Good value newer than the last
  accepted one, through the replay guard's mark.
- IDriverConnectionLossSource (Core.Abstractions): opt-in definitive-loss signal.
  DriverInstanceActor attaches in PreStart / detaches in PostStop and turns a raise
  into a disconnect only while Connected. OpcUaClient raises once per session on
  keep-alive BadSessionIdInvalid/BadSessionClosed/BadSessionNotActivated/
  BadServerHalted (measured: the SDK never re-opens a halted channel) or a dropped
  subscription; ambiguous codes stay with the #527 watchdog.
- Replay guard: one Information summary per recovery when the window closes
  ("dropped N late notifications across M refs"), with a timer so quiet
  subscriptions log it too.
- ReconnectPeriod deleted (options, AdminUI form, docs, tests); stored configs that
  carry reconnectPeriod still parse in the factory, probe and browser.
- Docs: OpcUaClient.md, DriverLifecycle.md, driver-specs.md, CLAUDE.md.

tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.IntegrationTests/OpcUaClientDriverWireTests.cs

@@ -41,10 +41,10 @@ public sealed class OpcUaClientDriverWireTests
 
     internal static OpcUaClientDriver NewDriver(
         ServerEventRig rig, string id, string? browseRoot = null, IReadOnlyList<RawTagEntry>? extraTags = null,
-        TimeSpan? reconnectPeriod = null) =>
+        string? endpointUrl = null, TimeSpan? timeout = null) =>
         new(new OpcUaClientDriverOptions
         {
-            EndpointUrl = rig.EndpointUrl,
+            EndpointUrl = endpointUrl ?? rig.EndpointUrl,
             RawTags =
             [
                 Tag(SpeedRef, ServerEventRig.RawNsu(SpeedId)),
@@ -58,11 +58,10 @@ public sealed class OpcUaClientDriverWireTests
             Username = "apikey",
             Password = ServerEventRig.KeyPassword,
             AutoAcceptCertificates = true,
-            Timeout = TimeSpan.FromSeconds(10),
+            Timeout = timeout ?? TimeSpan.FromSeconds(10),
             SessionTimeout = TimeSpan.FromSeconds(30),
             KeepAliveInterval = TimeSpan.FromSeconds(1),
             BrowseRoot = browseRoot,
-            ReconnectPeriod = reconnectPeriod ?? TimeSpan.FromSeconds(5),
         }, id);
 
     internal static async Task<ServerEventRig> StartRigAsync(string name, CancellationToken ct)