fix(driver-abcip-cli): resolve Medium code-review findings (Driver.AbCip.Cli-001, -002)

Driver.AbCip.Cli-001: WriteCommand.ParseValue wraps FormatException/
OverflowException as CommandException so bad --value input yields a clean
CLI error instead of a raw stack trace.
Driver.AbCip.Cli-002: probe/read/subscribe commands reject Structure types
up front (RejectStructure helper), matching the write guard.

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

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.AbCip.Cli/AbCipCommandBase.cs

@@ -56,4 +56,19 @@ public abstract class AbCipCommandBase : DriverCommandBase
     ///     multiple gateways in parallel can distinguish the logs.
     /// </summary>
     protected string DriverInstanceId => $"abcip-cli-{Gateway}";
+
+    /// <summary>
+    ///     Guards against <see cref="AbCipDataType.Structure"/> being passed to a command
+    ///     that does not support UDT layouts. Call at the top of <c>ExecuteAsync</c> for any
+    ///     command that accepts <c>--type</c> but cannot handle memberless Structure tags.
+    ///     Throws a <see cref="CliFx.Exceptions.CommandException"/> if <paramref name="type"/>
+    ///     is <see cref="AbCipDataType.Structure"/>.
+    /// </summary>
+    protected static void RejectStructure(AbCipDataType type)
+    {
+        if (type == AbCipDataType.Structure)
+            throw new CliFx.Exceptions.CommandException(
+                "Structure (UDT) reads are out of scope for this command — those need an explicit " +
+                "member layout, which belongs in a real driver config.");
+    }
 }