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/ModbusEdgeCaseValidationTests.cs

@@ -19,6 +19,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests;
 [Trait("Category", "Unit")]
 public sealed class ModbusEdgeCaseValidationTests
 {
+    /// <summary>Verifies that string tags with zero length are rejected during factory creation.</summary>
     [Fact]
     public void Factory_rejects_String_tag_with_StringLength_zero_via_structured_form()
     {
@@ -36,6 +37,7 @@ public sealed class ModbusEdgeCaseValidationTests
         ex.Message.ShouldContain("Greeting");
     }
 
+    /// <summary>Verifies that omitted string length defaults to zero and is rejected.</summary>
     [Fact]
     public void Factory_rejects_String_tag_with_StringLength_zero_via_missing_field()
     {
@@ -53,6 +55,7 @@ public sealed class ModbusEdgeCaseValidationTests
         ex.Message.ShouldContain("StringLength");
     }
 
+    /// <summary>Verifies that string tags with length one are accepted.</summary>
     [Fact]
     public void Factory_accepts_String_tag_with_StringLength_one()
     {
@@ -67,6 +70,7 @@ public sealed class ModbusEdgeCaseValidationTests
         Should.NotThrow(() => ModbusDriverFactoryExtensions.CreateInstance("modbus-1", json));
     }
 
+    /// <summary>Verifies that non-string tags are unaffected by string length zero.</summary>
     [Fact]
     public void Factory_accepts_non_String_tag_with_StringLength_zero()
     {
@@ -82,6 +86,9 @@ public sealed class ModbusEdgeCaseValidationTests
         Should.NotThrow(() => ModbusDriverFactoryExtensions.CreateInstance("modbus-1", json));
     }
 
+    /// <summary>Verifies that sub-second time spans are rounded up to at least one second.</summary>
+    /// <param name="ms">The input duration in milliseconds.</param>
+    /// <param name="expected">The expected clamped value in whole seconds.</param>
     [Theory]
     [InlineData(0, 1)]       // zero clamps up to 1
     [InlineData(500, 1)]     // 500 ms rounds up to 1
@@ -95,6 +102,7 @@ public sealed class ModbusEdgeCaseValidationTests
         ModbusTcpTransport.ClampToWholeSeconds(TimeSpan.FromMilliseconds(ms)).ShouldBe(expected);
     }
 
+    /// <summary>Verifies that negative time spans are treated as one second.</summary>
     [Fact]
     public void ClampToWholeSeconds_treats_negative_TimeSpan_as_one_second()
     {