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.IntegrationTests/AddressingGrammarTests.cs

@@ -18,6 +18,9 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests;
 public sealed class AddressingGrammarTests
 {
     private readonly ModbusSimulatorFixture _sim;
+
+    /// <summary>Initializes a new instance of the AddressingGrammarTests class.</summary>
+    /// <param name="sim">The Modbus simulator fixture.</param>
     public AddressingGrammarTests(ModbusSimulatorFixture sim) => _sim = sim;
 
     private async Task<ModbusDriver> NewDriverAsync(params ModbusTagDefinition[] tags)
@@ -32,6 +35,7 @@ public sealed class AddressingGrammarTests
         return drv;
     }
 
+    /// <summary>Verifies that 5-digit and 6-digit Modicon formats map to the same wire offset.</summary>
     [Fact]
     public async Task Modicon_5_And_6_Digit_Both_Map_To_Same_Wire_Offset()
     {
@@ -49,6 +53,7 @@ public sealed class AddressingGrammarTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that Float32 values roundtrip correctly with CDAB byte order.</summary>
     [Fact]
     public async Task Float32_With_CDAB_Roundtrips_Through_Wire()
     {
@@ -70,6 +75,7 @@ public sealed class AddressingGrammarTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that Int16 array reads surface as typed arrays.</summary>
     [Fact]
     public async Task Int16_Array_Reads_Surface_As_Typed_Array()
     {
@@ -86,6 +92,7 @@ public sealed class AddressingGrammarTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that block read coalescing reduces PDU count end-to-end.</summary>
     [Fact]
     public async Task Block_Read_Coalescing_Reduces_PDU_Count_End_To_End()
     {