Auto: focas-f4b — cnc_wrmacro + cnc_wrparam writes

Closes #269

src/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/IFocasClient.cs

@@ -43,6 +43,39 @@ public interface IFocasClient : IDisposable
         object? value,
         CancellationToken cancellationToken);
 
+    /// <summary>
+    ///     Write a CNC parameter value via <c>cnc_wrparam</c> (FWLIB <c>IODBPSD</c> packet —
+    ///     byte layout symmetric with the <c>cnc_rdparam</c> read side). Plan PR F4-b
+    ///     (issue #269). The <paramref name="address"/> is parsed from a <c>PARAM:N</c>
+    ///     tag string; <paramref name="type"/> drives the payload width (Byte / Int16 /
+    ///     Int32). Default impl returns <see cref="FocasStatusMapper.BadNotSupported"/>
+    ///     so transports that haven't yet routed the write keep compiling.
+    ///     <para>EW_PASSWD from the CNC (parameter-write switch off / unlock required)
+    ///     surfaces as <see cref="FocasStatusMapper.BadUserAccessDenied"/>; F4-d will
+    ///     wire the unlock workflow on top.</para>
+    /// </summary>
+    Task<uint> WriteParameterAsync(
+        FocasAddress address,
+        FocasDataType type,
+        object? value,
+        CancellationToken cancellationToken)
+        => Task.FromResult(FocasStatusMapper.BadNotSupported);
+
+    /// <summary>
+    ///     Write a CNC macro variable value via <c>cnc_wrmacro</c> (FWLIB <c>ODBM</c> packet
+    ///     symmetric with the <c>cnc_rdmacro</c> read side). Plan PR F4-b (issue #269).
+    ///     The implementation encodes <paramref name="value"/> as <c>(intValue,
+    ///     decimalPointCount)</c>; today we ship integer-only (<c>decimalPointCount = 0</c>)
+    ///     to match the most common HMI pattern, and a future <c>WriteMacroScaled</c>
+    ///     overload can land if the field calls for fractional macro setpoints.
+    ///     Default impl returns <see cref="FocasStatusMapper.BadNotSupported"/>.
+    /// </summary>
+    Task<uint> WriteMacroAsync(
+        FocasAddress address,
+        object? value,
+        CancellationToken cancellationToken)
+        => Task.FromResult(FocasStatusMapper.BadNotSupported);
+
     /// <summary>
     ///     Cheap health probe — e.g. <c>cnc_rdcncstat</c>. Returns <c>true</c> when the CNC
     ///     responds with any valid status.