fix(driver-twincat-cli): resolve Low code-review findings (Driver.TwinCAT.Cli-001,002,003,004,005,006,007)

- Driver.TwinCAT.Cli-001: TwinCATCommandBase.Validate rejects
  non-positive TimeoutMs / IntervalMs and AmsPort outside 1..65535;
  ExecuteAsync calls it first.
- Driver.TwinCAT.Cli-002: SubscribeCommand serialises every WriteLine
  through a writeLock to remove the notification-callback vs banner
  interleave risk.
- Driver.TwinCAT.Cli-003: SubscribeCommand.DescribeMechanism derives
  the banner label from the returned ISubscriptionHandle.DiagnosticId
  so it can't disagree with what the driver actually did.
- Driver.TwinCAT.Cli-004: introduced TwinCATTagCommandBase carrying
  --poll-only + BuildOptions; BrowseCommand stays on the slimmer
  TwinCATCommandBase so --poll-only no longer surfaces in browse --help.
- Driver.TwinCAT.Cli-005: ProbeCommand --type now carries the 't' short
  alias to match the other commands.
- Driver.TwinCAT.Cli-006: 35 new tests covering Gateway / AmsAddress
  parse / BuildOptions / PollOnly / browse-helpers / probe-alias /
  mechanism derivation.
- Driver.TwinCAT.Cli-007: replaced the empty-init <inheritdoc/> with an
  explicit summary warning future maintainers about the no-op init.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Cli.Tests/SubscribeCommandMechanismTests.cs

@@ -0,0 +1,37 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
+using ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Cli.Commands;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Cli.Tests;
+
+/// <summary>
+///     Driver.TwinCAT.Cli-003: the subscribe banner mechanism label is derived from the
+///     <see cref="ISubscriptionHandle.DiagnosticId"/> the driver actually returned, not from
+///     the <c>--poll-only</c> flag. That way the banner cannot disagree with what the driver
+///     did even if a future fallback path lands the subscription somewhere unexpected.
+/// </summary>
+[Trait("Category", "Unit")]
+public sealed class SubscribeCommandMechanismTests
+{
+    private sealed record StubHandle(string DiagnosticId) : ISubscriptionHandle;
+
+    [Theory]
+    [InlineData("twincat-native-sub-1")]
+    [InlineData("twincat-native-sub-42")]
+    [InlineData("twincat-native-sub-9223372036854775807")]
+    public void DescribeMechanism_returns_ADS_notification_for_native_handle(string diagId)
+    {
+        SubscribeCommand.DescribeMechanism(new StubHandle(diagId)).ShouldBe("ADS notification");
+    }
+
+    [Theory]
+    [InlineData("pollgroup-1")]
+    [InlineData("modbus-poll-7")]
+    [InlineData("")]
+    [InlineData("TWINCAT-NATIVE-SUB-1")] // ordinal comparison — uppercase prefix does NOT match.
+    public void DescribeMechanism_returns_polling_for_anything_else(string diagId)
+    {
+        SubscribeCommand.DescribeMechanism(new StubHandle(diagId)).ShouldBe("polling");
+    }
+}