docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests/ModbusArrayTests.cs

@@ -21,6 +21,7 @@ public sealed class ModbusArrayTests
         return (drv, fake);
     }
 
+    /// <summary>Verifies reading an Int16 array returns a typed array.</summary>
     [Fact]
     public async Task Read_Int16_Array_Returns_Typed_Array()
     {
@@ -34,6 +35,7 @@ public sealed class ModbusArrayTests
         arr.ShouldBe(new short[] { 100, 101, 102, 103, 104 });
     }
 
+    /// <summary>Verifies reading a Float32 array with word swap returns a typed array.</summary>
     [Fact]
     public async Task Read_Float32_Array_Returns_Typed_Array_With_WordSwap()
     {
@@ -60,6 +62,7 @@ public sealed class ModbusArrayTests
         arr.ShouldBe(src);
     }
 
+    /// <summary>Verifies reading a coil array returns a bool array.</summary>
     [Fact]
     public async Task Read_Coil_Array_Returns_Bool_Array()
     {
@@ -74,6 +77,7 @@ public sealed class ModbusArrayTests
         arr.ShouldBe(new[] { true, false, true, false, true, false, true, false, true, false });
     }
 
+    /// <summary>Verifies writing an Int16 array lands contiguously in the register bank.</summary>
     [Fact]
     public async Task Write_Int16_Array_Lands_Contiguous_In_Bank()
     {
@@ -91,6 +95,7 @@ public sealed class ModbusArrayTests
             fake.HoldingRegisters[50 + i].ShouldBe((ushort)write[i]);
     }
 
+    /// <summary>Verifies writing a coil array packs bits in LSB-first order.</summary>
     [Fact]
     public async Task Write_Coil_Array_Packs_LSB_First()
     {
@@ -108,6 +113,7 @@ public sealed class ModbusArrayTests
             fake.Coils[i].ShouldBe(pattern[i]);
     }
 
+    /// <summary>Verifies writing an array with mismatched length surfaces an error.</summary>
     [Fact]
     public async Task Write_Array_Mismatch_Length_Surfaces_Error()
     {
@@ -122,6 +128,7 @@ public sealed class ModbusArrayTests
         results[0].StatusCode.ShouldNotBe(0u);
     }
 
+    /// <summary>Verifies discovery surfaces IsArray and ArrayDim correctly.</summary>
     [Fact]
     public async Task Discovery_Surfaces_IsArray_And_ArrayDim()
     {
@@ -137,6 +144,7 @@ public sealed class ModbusArrayTests
         captured[0].ArrayDim.ShouldBe(8u);
     }
 
+    /// <summary>Verifies scalar tag discovery keeps IsArray false.</summary>
     [Fact]
     public async Task Scalar_Tag_Discovery_Stays_NonArray()
     {
@@ -152,19 +160,43 @@ public sealed class ModbusArrayTests
         captured[0].ArrayDim.ShouldBeNull();
     }
 
+    /// <summary>Recording address space builder for capturing discovered attributes.</summary>
+    /// <param name="captured">List to capture discovered attributes into.</param>
     private sealed class RecordingBuilder(List<DriverAttributeInfo> captured) : IAddressSpaceBuilder
     {
+        /// <summary>Creates a folder in the address space.</summary>
+        /// <param name="browseName">The browse name of the folder.</param>
+        /// <param name="displayName">The display name of the folder.</param>
+        /// <returns>This builder instance.</returns>
         public IAddressSpaceBuilder Folder(string browseName, string displayName) => this;
+
+        /// <summary>Creates a variable in the address space.</summary>
+        /// <param name="browseName">The browse name of the variable.</param>
+        /// <param name="displayName">The display name of the variable.</param>
+        /// <param name="attributeInfo">The attribute information.</param>
+        /// <returns>A variable handle.</returns>
         public IVariableHandle Variable(string browseName, string displayName, DriverAttributeInfo attributeInfo)
         {
             captured.Add(attributeInfo);
             return new StubHandle(browseName);
         }
+
+        /// <summary>Adds a property to the current node.</summary>
+        /// <param name="browseName">The browse name of the property.</param>
+        /// <param name="dataType">The data type of the property.</param>
+        /// <param name="value">The property value.</param>
         public void AddProperty(string browseName, DriverDataType dataType, object? value) { }
 
+        /// <summary>Stub variable handle for testing.</summary>
+        /// <param name="fullRef">The full reference of the handle.</param>
         private sealed class StubHandle(string fullRef) : IVariableHandle
         {
+            /// <summary>Gets the full reference.</summary>
             public string FullReference => fullRef;
+
+            /// <summary>Marks this variable as an alarm condition.</summary>
+            /// <param name="info">The alarm condition information.</param>
+            /// <returns>An alarm condition sink.</returns>
             public IAlarmConditionSink MarkAsAlarmCondition(AlarmConditionInfo info)
                 => throw new NotSupportedException("RecordingBuilder doesn't model alarms");
         }