Expand XML docs across bridge and test code

src/ZB.MOM.WW.LmxOpcUa.Host/Domain/QualityMapper.cs

@@ -9,6 +9,8 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.Domain
         /// Maps an MXAccess quality integer (OPC DA quality byte) to domain Quality.
         /// Uses category bits: 192+ = Good, 64-191 = Uncertain, 0-63 = Bad.
         /// </summary>
+        /// <param name="mxQuality">The raw MXAccess quality integer.</param>
+        /// <returns>The mapped bridge quality value.</returns>
         public static Quality MapFromMxAccessQuality(int mxQuality)
         {
             var b = (byte)(mxQuality & 0xFF);
@@ -26,6 +28,8 @@ namespace ZB.MOM.WW.LmxOpcUa.Host.Domain
         /// <summary>
         /// Maps domain Quality to OPC UA StatusCode uint32.
         /// </summary>
+        /// <param name="quality">The bridge quality value.</param>
+        /// <returns>The OPC UA status code represented as a 32-bit unsigned integer.</returns>
         public static uint MapToOpcUaStatusCode(Quality quality)
         {
             return quality switch