Auto: abcip-2.5 — online tag-DB refresh trigger

Add IDriverControl capability interface in Core.Abstractions with a
RebrowseAsync(IAddressSpaceBuilder, CancellationToken) hook so operators
can force a controller-side @tags re-walk without restarting the driver.

AbCipDriver now implements IDriverControl. RebrowseAsync clears the UDT
template cache (so stale shapes from a pre-download program don't
survive) then runs the same enumerator + builder fan-out as
DiscoverAsync, serialised against concurrent discovery / rebrowse via
a new SemaphoreSlim.

Driver.AbCip.Cli ships a `rebrowse` subcommand mirroring the existing
probe / read shape: connects to a single gateway, runs RebrowseAsync
against an in-memory builder, and prints discovered tag names so
operators can sanity-check the controller's symbol table from a shell.

Tests cover: two consecutive RebrowseAsync calls bump the enumerator's
Create / Enumerate counters once each, discovered tags reach the
supplied builder, the template cache is dropped on rebrowse, and the
driver exposes IDriverControl. 313 AbCip unit tests + 17 CLI tests +
37 Core.Abstractions tests pass.

Closes #233

src/ZB.MOM.WW.OtOpcUa.Driver.AbCip/AbCipDriver.cs

@@ -22,7 +22,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip;
 ///     <see cref="PlcTagHandle"/> and reconnects each device.</para>
 /// </remarks>
 public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery, ISubscribable,
-    IHostConnectivityProbe, IPerCallHostResolver, IAlarmSource, IDisposable, IAsyncDisposable
+    IHostConnectivityProbe, IPerCallHostResolver, IAlarmSource, IDriverControl, IDisposable, IAsyncDisposable
 {
     private readonly AbCipDriverOptions _options;
     private readonly string _driverInstanceId;
@@ -34,6 +34,7 @@ public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery,
     private readonly Dictionary<string, DeviceState> _devices = new(StringComparer.OrdinalIgnoreCase);
     private readonly Dictionary<string, AbCipTagDefinition> _tagsByName = new(StringComparer.OrdinalIgnoreCase);
     private readonly AbCipAlarmProjection _alarmProjection;
+    private readonly SemaphoreSlim _discoverySemaphore = new(1, 1);
     private DriverHealth _health = new(DriverState.Unknown, null, null);
 
     public event EventHandler<DataChangeEventArgs>? OnDataChange;
@@ -967,6 +968,43 @@ public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery,
     public async Task DiscoverAsync(IAddressSpaceBuilder builder, CancellationToken cancellationToken)
     {
         ArgumentNullException.ThrowIfNull(builder);
+        await _discoverySemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
+        try
+        {
+            await DiscoverCoreAsync(builder, cancellationToken).ConfigureAwait(false);
+        }
+        finally
+        {
+            _discoverySemaphore.Release();
+        }
+    }
+
+    /// <summary>
+    ///     PR abcip-2.5 — operator-triggered rebrowse. Drops the cached UDT template shapes so
+    ///     the next read re-fetches them from the controller, then runs the same enumerator
+    ///     walk + builder fan-out that <see cref="DiscoverAsync"/> drives. Serialised against
+    ///     other rebrowse / discovery passes via <see cref="_discoverySemaphore"/> so two
+    ///     concurrent triggers don't double-issue the @tags read.
+    /// </summary>
+    public async Task RebrowseAsync(IAddressSpaceBuilder builder, CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+        await _discoverySemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
+        try
+        {
+            // Stale template shapes can outlive a controller program-download, so a rebrowse
+            // is the natural moment to drop them; subsequent UDT reads re-populate on demand.
+            _templateCache.Clear();
+            await DiscoverCoreAsync(builder, cancellationToken).ConfigureAwait(false);
+        }
+        finally
+        {
+            _discoverySemaphore.Release();
+        }
+    }
+
+    private async Task DiscoverCoreAsync(IAddressSpaceBuilder builder, CancellationToken cancellationToken)
+    {
         var root = builder.Folder("AbCip", "AbCip");
 
         foreach (var device in _options.Devices)
@@ -1076,6 +1114,7 @@ public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery,
     public async ValueTask DisposeAsync()
     {
         await ShutdownAsync(CancellationToken.None).ConfigureAwait(false);
+        _discoverySemaphore.Dispose();
     }
 
     /// <summary>