Driver-instance bootstrap pipeline (#248) — DriverInstance rows materialise as live IDriver instances

Closes the gap surfaced by Phase 7 live smoke (#240): DriverInstance rows in
the central config DB had no path to materialise as live IDriver instances in
DriverHost, so virtual-tag scripts read BadNodeIdUnknown for every tag.

## DriverFactoryRegistry (Core.Hosting)
Process-singleton type-name → factory map. Each driver project's static
Register call pre-loads its factory at Program.cs startup; the bootstrapper
looks up by DriverInstance.DriverType + invokes with (DriverInstanceId,
DriverConfig JSON). Case-insensitive; duplicate-type registration throws.

## GalaxyProxyDriverFactoryExtensions.Register (Driver.Galaxy.Proxy)
Static helper — no Microsoft.Extensions.DependencyInjection dep, keeps the
driver project free of DI machinery. Parses DriverConfig JSON for PipeName +
SharedSecret + ConnectTimeoutMs. DriverInstanceId from the row wins over JSON
per the schema's UX_DriverInstance_Generation_LogicalId.

## DriverInstanceBootstrapper (Server)
After NodeBootstrap loads the published generation: queries DriverInstance
rows scoped to that generation, looks up the factory per row, constructs +
DriverHost.RegisterAsync (which calls InitializeAsync). Per plan decision
#12 (driver isolation), failure of one driver doesn't prevent others —
logs ERR + continues + returns the count actually registered. Unknown
DriverType (factory not registered) logs WRN + skips so a missing-assembly
deployment doesn't take down the whole server.

## Wired into OpcUaServerService.ExecuteAsync
After NodeBootstrap.LoadCurrentGenerationAsync, before
PopulateEquipmentContentAsync + Phase7Composer.PrepareAsync. The Phase 7
chain now sees a populated DriverHost so CachedTagUpstreamSource has an
upstream feed.

## Live evidence on the dev box
Re-ran the Phase 7 smoke from task #240. Pre-#248 vs post-#248:
  Equipment namespace snapshots loaded for 0/0 driver(s)  ← before
  Equipment namespace snapshots loaded for 1/1 driver(s)  ← after

Galaxy.Host pipe ACL denied our SID (env-config issue documented in
docs/ServiceHosting.md, NOT a code issue) — the bootstrapper logged it as
"failed to initialize, driver state will reflect Faulted" and continued past
the failure exactly per plan #12. The rest of the pipeline (Equipment walker
+ Phase 7 composer) ran to completion.

## Tests — 5 new DriverFactoryRegistryTests
Register + TryGet round-trip, case-insensitive lookup, duplicate-type throws,
null-arg guards, RegisteredTypes snapshot. Pure functions; no DI/DB needed.
The bootstrapper's DB-query path is exercised by the live smoke (#240) which
operators run before each release.

src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy/GalaxyProxyDriverFactoryExtensions.cs

@@ -0,0 +1,59 @@
+using System.Text.Json;
+using ZB.MOM.WW.OtOpcUa.Core.Hosting;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy;
+
+/// <summary>
+///     Static factory registration helper for <see cref="GalaxyProxyDriver"/>. Server's
+///     Program.cs calls <see cref="Register"/> once at startup; the bootstrapper (task #248)
+///     then materialises Galaxy DriverInstance rows from the central config DB into live
+///     driver instances. No dependency on Microsoft.Extensions.DependencyInjection so the
+///     driver project stays free of DI machinery.
+/// </summary>
+public static class GalaxyProxyDriverFactoryExtensions
+{
+    public const string DriverTypeName = "Galaxy";
+
+    /// <summary>
+    ///     Register the Galaxy driver factory in the supplied <see cref="DriverFactoryRegistry"/>.
+    ///     Throws if 'Galaxy' is already registered — single-instance per process.
+    /// </summary>
+    public static void Register(DriverFactoryRegistry registry)
+    {
+        ArgumentNullException.ThrowIfNull(registry);
+        registry.Register(DriverTypeName, CreateInstance);
+    }
+
+    internal static GalaxyProxyDriver CreateInstance(string driverInstanceId, string driverConfigJson)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(driverInstanceId);
+        ArgumentException.ThrowIfNullOrWhiteSpace(driverConfigJson);
+
+        // DriverConfig column is a JSON object that mirrors GalaxyProxyOptions.
+        // Required: PipeName, SharedSecret. Optional: ConnectTimeoutMs (defaults to 10s).
+        // The DriverInstanceId from the row wins over any value in the JSON — the row
+        // is the authoritative identity per the schema's UX_DriverInstance_Generation_LogicalId.
+        using var doc = JsonDocument.Parse(driverConfigJson);
+        var root = doc.RootElement;
+
+        string pipeName = root.TryGetProperty("PipeName", out var p) && p.ValueKind == JsonValueKind.String
+            ? p.GetString()!
+            : throw new InvalidOperationException(
+                $"GalaxyProxyDriver config for '{driverInstanceId}' missing required PipeName");
+        string sharedSecret = root.TryGetProperty("SharedSecret", out var s) && s.ValueKind == JsonValueKind.String
+            ? s.GetString()!
+            : throw new InvalidOperationException(
+                $"GalaxyProxyDriver config for '{driverInstanceId}' missing required SharedSecret");
+        var connectTimeout = root.TryGetProperty("ConnectTimeoutMs", out var t) && t.ValueKind == JsonValueKind.Number
+            ? TimeSpan.FromMilliseconds(t.GetInt32())
+            : TimeSpan.FromSeconds(10);
+
+        return new GalaxyProxyDriver(new GalaxyProxyOptions
+        {
+            DriverInstanceId = driverInstanceId,
+            PipeName = pipeName,
+            SharedSecret = sharedSecret,
+            ConnectTimeout = connectTimeout,
+        });
+    }
+}

src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Proxy.csproj

@@ -13,6 +13,7 @@
 
     <ItemGroup>
         <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Core.Abstractions\ZB.MOM.WW.OtOpcUa.Core.Abstractions.csproj"/>
+        <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Core\ZB.MOM.WW.OtOpcUa.Core.csproj"/>
         <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Shared\ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Shared.csproj"/>
         <ProjectReference Include="..\ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian\ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian.csproj"/>
     </ItemGroup>