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/DL205/DL205CoilMappingTests.cs

@@ -14,6 +14,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests.DL205;
 [Trait("Device", "DL205")]
 public sealed class DL205CoilMappingTests(ModbusSimulatorFixture sim)
 {
+    /// <summary>Verifies that DirectLOGIC Y0 output maps to Modbus coil 2048.</summary>
     [Fact]
     public async Task DL260_Y0_maps_to_coil_2048()
     {
@@ -40,6 +41,7 @@ public sealed class DL205CoilMappingTests(ModbusSimulatorFixture sim)
         results[0].Value.ShouldBe(true, "dl205.json seeds coil 2048 (Y0) = ON");
     }
 
+    /// <summary>Verifies that DirectLOGIC C0 relay maps to Modbus coil 3072.</summary>
     [Fact]
     public async Task DL260_C0_maps_to_coil_3072()
     {
@@ -66,6 +68,7 @@ public sealed class DL205CoilMappingTests(ModbusSimulatorFixture sim)
         results[0].Value.ShouldBe(true, "dl205.json seeds coil 3072 (C0) = ON");
     }
 
+    /// <summary>Verifies that a scratch DirectLOGIC C relay supports write and read operations.</summary>
     [Fact]
     public async Task DL260_scratch_Crelay_supports_write_then_read()
     {