fix(tests,cli): implement IOpcUaAddressSpaceSink.EnsureVariable in test fakes; fix CLI CS1587

Resolves the 12 reported build errors (7 CS0535 sink fakes + 5 CLI CS1587).
Runtime.Tests green (74). NOTE: OpcUaServer.Tests still has pre-existing CS7036
errors from the in-progress Galaxy-tag workstream (Phase7Plan/Phase7CompositionResult
new required params) — separate, test-only, not addressed here.

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Cli/Commands/SubscribeCommand.cs

@@ -12,20 +12,20 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Cli.Commands;
 [Command("subscribe", Description = "Watch a PCCC file address via polled subscription until Ctrl+C.")]
 public sealed class SubscribeCommand : AbLegacyCommandBase
 {
-    [CommandOption("address", 'a', Description = "PCCC file address — same format as `read`.", IsRequired = true)]
     /// <summary>Gets or sets the PCCC file address to subscribe to.</summary>
+    [CommandOption("address", 'a', Description = "PCCC file address — same format as `read`.", IsRequired = true)]
     public string Address { get; init; } = default!;
 
+    /// <summary>Gets or sets the data type of the address.</summary>
     [CommandOption("type", 't', Description =
         "Bit / Int / Long / Float / AnalogInt / String / TimerElement / CounterElement / " +
         "ControlElement (default Int).")]
-    /// <summary>Gets or sets the data type of the address.</summary>
     public AbLegacyDataType DataType { get; init; } = AbLegacyDataType.Int;
 
+    /// <summary>Gets or sets the polling interval in milliseconds.</summary>
     [CommandOption("interval-ms", 'i', Description =
         "Publishing interval in milliseconds (default 1000). PollGroupEngine floors " +
         "sub-250ms values.")]
-    /// <summary>Gets or sets the polling interval in milliseconds.</summary>
     public int IntervalMs { get; init; } = 1000;
 
     /// <inheritdoc />

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.S7.Cli/Commands/ProbeCommand.cs

@@ -13,14 +13,14 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Cli.Commands;
 [Command("probe", Description = "Verify the S7 endpoint is reachable and a sample read succeeds.")]
 public sealed class ProbeCommand : S7CommandBase
 {
+    /// <summary>Gets or sets the S7 address to probe.</summary>
     [CommandOption("address", 'a', Description =
         "Probe address (default MW0 — merker word 0). DB1.DBW0 if your PLC project " +
         "reserves a fingerprint DB.")]
-    /// <summary>Gets or sets the S7 address to probe.</summary>
     public string Address { get; init; } = "MW0";
 
-    [CommandOption("type", Description = "Probe data type (default Int16).")]
     /// <summary>Gets or sets the data type of the probe address.</summary>
+    [CommandOption("type", Description = "Probe data type (default Int16).")]
     public S7DataType DataType { get; init; } = S7DataType.Int16;
 
     /// <inheritdoc />