Auto: focas-f4b — cnc_wrmacro + cnc_wrparam writes

Closes #269

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

@@ -19,6 +19,16 @@ public static class FocasStatusMapper
     public const uint BadTimeout = 0x800A0000u;
     public const uint BadTypeMismatch = 0x80730000u;
 
+    /// <summary>
+    ///     OPC UA <c>BadUserAccessDenied</c>. Surfaced when the CNC reports
+    ///     <c>EW_PASSWD</c> (parameter-write switch off, MDI mode required, etc.) — the
+    ///     deployment must escalate the operator's session to satisfy the write gate.
+    ///     Plan PR F4-d will land the unlock workflow that lets operators flip the gate
+    ///     from the OPC UA side; F4-b just maps the status code so clients can branch
+    ///     on it. (Plan PR F4-b, issue #269.)
+    /// </summary>
+    public const uint BadUserAccessDenied = 0x801F0000u;
+
     /// <summary>
     ///     Map common FWLIB <c>EW_*</c> return codes. The values below match Fanuc's published
     ///     numeric conventions (EW_OK=0, EW_FUNC=1, EW_NUMBER=3, EW_LENGTH=4, EW_ATTRIB=7,
@@ -37,7 +47,7 @@ public static class FocasStatusMapper
         7 => BadTypeMismatch,          // EW_ATTRIB
         8 => BadNodeIdUnknown,         // EW_DATA — invalid data address
         9 => BadCommunicationError,    // EW_PARITY
-        11 => BadNotWritable,          // EW_PASSWD
+        11 => BadUserAccessDenied,     // EW_PASSWD — parameter-write switch off / unlock required (F4-d)
         -1 => BadDeviceFailure,        // EW_BUSY
         -8 => BadInternalError,        // EW_HANDLE — CNC handle not available
         -9 => BadNotSupported,         // EW_VERSION — FWLIB vs CNC version mismatch