docs(historian-gateway): document gateway backend, config keys, EnsureTags hook, known gates; retire Wonderware from docs

HistorianGateway is now the sole historian backend (read + alarm SendEvent +
continuous WriteLiveValues). Document the final state and retire the Wonderware
sidecar from the docs/config/labels:

- CLAUDE.md: rewrite the Historian section — ServerHistorian /
  ContinuousHistorization / AlarmHistorian config keys, the IHistorianProvisioning
  EnsureTags hook, the GatewayAlarmHistorianWriter SendEvent path + ReadEvents
  dependency on gateway RuntimeDb:EventReadsEnabled=true, gateway-side
  prerequisites (RuntimeDb flags + historian:read/write/tags:write scopes),
  migration note, and two KNOWN-LIMITATION callouts (live-validation gate +
  empty historized-ref-set recorder follow-on).
- appsettings.json: fix the stale ServerHistorian block (Host/Port/SharedSecret/
  ServerCertThumbprint -> Endpoint/ApiKey/UseTls/AllowUntrustedServerCertificate/
  CaCertificatePath/CallTimeout, keep MaxTieClusterOverfetch); add a disabled
  ContinuousHistorization block; prune the orphaned Wonderware keys from
  AlarmHistorian (keep the SQLite knobs). ApiKey env-supplied via
  ServerHistorian__ApiKey (commented; valid strict JSON via _comment keys).
- README.md + docs (Historian.md, AlarmHistorian.md, Configuration.md,
  ServiceHosting.md, DriverLifecycle.md, drivers/README.md, Uns.md, VirtualTags.md,
  AlarmTracking.md, Client.UI.md, README.md, TestConnectProbes.md): retire the
  Wonderware historian backend from current-backend descriptions; fix the stale
  ServerHistorian/AlarmHistorian config tables (now gateway shape); convert
  drivers/Historian.Wonderware.md to a retired stub pointing at the gateway.
- Source/UI labels (descriptive text only, no behavior change):
  OtOpcUaServerHostedService.cs, HistoryPaging.cs, OtOpcUaSdkServer.cs,
  HistorianAdapterActor.cs, VirtualTagModal.razor, ScriptedAlarmModal.razor,
  AlarmsHistorian.razor now name the HistorianGateway backend.

Build clean (0 errors); AdminUI.Tests green (514 passed).

Claude-Session: https://claude.ai/code/session_012SDSQ3AcaXqPcBtDESBRii

src/Server/ZB.MOM.WW.OtOpcUa.Host/OpcUa/OtOpcUaServerHostedService.cs

@@ -53,7 +53,7 @@ public sealed class OtOpcUaServerHostedService : IHostedService, IAsyncDisposabl
     /// <param name="historianDataSource">The server-side HistoryRead backend resolved from DI — the
     /// <c>NullHistorianDataSource</c> default seeded by <c>AddOtOpcUaRuntime</c> (which runs on this driver
     /// node, the same source the address-space sink + node-write gateway come from), or the configured
-    /// Wonderware read client when <c>AddServerHistorian</c> enabled it. Wired onto the node manager in
+    /// HistorianGateway read client when <c>AddServerHistorian</c> enabled it. Wired onto the node manager in
     /// <see cref="StartAsync"/>.</param>
     /// <param name="configuration">App configuration; the <c>ServerHistorian</c> section is bound here to
     /// read <see cref="ServerHistorianOptions.MaxTieClusterOverfetch"/> for the node manager. Bound directly
@@ -211,7 +211,7 @@ public sealed class OtOpcUaServerHostedService : IHostedService, IAsyncDisposabl
             logger: _loggerFactory.CreateLogger<ActorNodeWriteGateway>()));
 
         // Wire the server-side read backend resolved from DI — the NullHistorianDataSource default (when
-        // the ServerHistorian section is disabled) or the configured Wonderware read client (when enabled).
+        // the ServerHistorian section is disabled) or the configured HistorianGateway read client (when enabled).
         // The node manager's HistoryRead overrides block-bridge to whatever source is set here.
         _server.SetHistorianDataSource(_historianDataSource);
 

src/Server/ZB.MOM.WW.OtOpcUa.Host/appsettings.json

@@ -11,24 +11,37 @@
       "DisableLogin": false
     }
   },
+  "ServerHistorian": {
+    "_comment": "Server-side HistoryRead backend (the ZB.MOM.WW.HistorianGateway gRPC client). Disabled => NullHistorianDataSource (historized nodes return GoodNoData). The gateway must run RuntimeDb:EventReadsEnabled=true for alarm-history ReadEvents, and the API key must carry historian:read + historian:write + historian:tags:write scopes.",
+    "Enabled": false,
+    "Endpoint": "",
+    "ApiKey": "",
+    "_ApiKeyComment": "NEVER commit a real key. Supply via the environment variable ServerHistorian__ApiKey.",
+    "UseTls": true,
+    "AllowUntrustedServerCertificate": false,
+    "CaCertificatePath": null,
+    "CallTimeout": "00:00:30",
+    "MaxTieClusterOverfetch": 65536
+  },
+  "ContinuousHistorization": {
+    "_comment": "Continuous historization of driver (non-Galaxy) tag values: a crash-safe FasterLog outbox + recorder draining to the ServerHistorian gateway's WriteLiveValues. Disabled => no recorder is spawned. Requires ServerHistorian to be configured; the gateway connection (endpoint/key/TLS) is sourced from the ServerHistorian section, not here.",
+    "Enabled": false,
+    "OutboxPath": "",
+    "_OutboxPathComment": "Directory holding the FasterLog segment + commit files. Required when Enabled=true. In production set an ABSOLUTE path on durable storage.",
+    "CommitMode": "PerEntry",
+    "CommitIntervalMs": 100,
+    "DrainBatchSize": 64,
+    "DrainIntervalSeconds": 2,
+    "Capacity": 0,
+    "MinBackoffSeconds": 1,
+    "MaxBackoffSeconds": 30
+  },
   "AlarmHistorian": {
+    "_comment": "Durable SQLite store-and-forward alarm sink. Drains alarm events to the ServerHistorian gateway's SendEvent path; the downstream connection (endpoint/key/TLS) is sourced from the ServerHistorian section.",
     "Enabled": false,
     "DatabasePath": "alarm-historian.db",
-    "Host": "localhost",
-    "Port": 32569,
-    "UseTls": false,
-    "ServerCertThumbprint": null,
-    "SharedSecret": "",
     "DrainIntervalSeconds": 5,
     "Capacity": 1000000,
     "DeadLetterRetentionDays": 30
-  },
-  "ServerHistorian": {
-    "Enabled": false,
-    "Host": "localhost",
-    "Port": 32569,
-    "UseTls": false,
-    "ServerCertThumbprint": null,
-    "SharedSecret": ""
   }
 }