docs: complete XML doc comments via fixdocs (2757 to 131 findings)

Add missing <returns>/<param>/<summary>/<typeparam> tags and clean up
misused inheritdoc across 481 files so the documented API surface is
complete. Documentation-only (zero code lines changed). The 131 remaining
findings are inheritdoc-style warnings deliberately left to preserve
hand-written implementation rationale (plan-decision notes, race-condition
explanations).

tests/Core/ZB.MOM.WW.OtOpcUa.Core.Tests/OpcUa/EquipmentNodeWalkerTests.cs

@@ -377,9 +377,7 @@ public sealed class EquipmentNodeWalkerTests
         /// <summary>Gets the list of properties.</summary>
         public List<RecordingProperty> Properties { get; } = new();
 
-        /// <summary>Creates a folder child node.</summary>
-        /// <param name="name">The browse name of the folder.</param>
-        /// <param name="_">The display name (unused).</param>
+        /// <inheritdoc />
         public IAddressSpaceBuilder Folder(string name, string _)
         {
             var child = new RecordingBuilder(name);
@@ -387,10 +385,7 @@ public sealed class EquipmentNodeWalkerTests
             return child;
         }
 
-        /// <summary>Creates a variable node.</summary>
-        /// <param name="name">The browse name of the variable.</param>
-        /// <param name="_">The display name (unused).</param>
-        /// <param name="attr">The attribute information for the variable.</param>
+        /// <inheritdoc />
         public IVariableHandle Variable(string name, string _, DriverAttributeInfo attr)
         {
             var v = new RecordingVariable(name, attr);
@@ -398,10 +393,7 @@ public sealed class EquipmentNodeWalkerTests
             return v;
         }
 
-        /// <summary>Adds a property to the node.</summary>
-        /// <param name="name">The browse name of the property.</param>
-        /// <param name="_">The data type (unused).</param>
-        /// <param name="value">The value of the property.</param>
+        /// <inheritdoc />
         public void AddProperty(string name, DriverDataType _, object? value) =>
             Properties.Add(new RecordingProperty(name, value));
     }
@@ -412,10 +404,9 @@ public sealed class EquipmentNodeWalkerTests
     /// <summary>Recorded variable for test verification.</summary>
     private sealed record RecordingVariable(string BrowseName, DriverAttributeInfo AttributeInfo) : IVariableHandle
     {
-        /// <summary>Gets the full reference of the variable.</summary>
+        /// <inheritdoc />
         public string FullReference => AttributeInfo.FullName;
-        /// <summary>Marks the variable as an alarm condition.</summary>
-        /// <param name="info">The alarm condition information.</param>
+        /// <inheritdoc />
         public IAlarmConditionSink MarkAsAlarmCondition(AlarmConditionInfo info) => throw new NotSupportedException();
     }
 }