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/ExceptionInjectionTests.cs

@@ -60,6 +60,10 @@ public sealed class ExceptionInjectionTests(ModbusSimulatorFixture sim)
         return await driver.ReadAsync([tagName], TestContext.Current.CancellationToken);
     }
 
+    /// <summary>Verifies that Modbus FC03 reads at injected exception addresses surface the expected OPC UA status codes.</summary>
+    /// <param name="address">The Modbus register address to read.</param>
+    /// <param name="expectedStatus">The expected OPC UA status code.</param>
+    /// <param name="scenario">Scenario description for assertion messages.</param>
     [Theory]
     [InlineData(1000, StatusBadNotSupported,        "exc 0x01 (Illegal Function) -> BadNotSupported")]
     [InlineData(1001, StatusBadOutOfRange,          "exc 0x02 (Illegal Data Address) -> BadOutOfRange")]
@@ -77,6 +81,7 @@ public sealed class ExceptionInjectionTests(ModbusSimulatorFixture sim)
         results[0].StatusCode.ShouldBe(expectedStatus, scenario);
     }
 
+    /// <summary>Verifies that reads at non-injected addresses return Good status.</summary>
     [Fact]
     public async Task FC03_read_at_non_injected_address_returns_Good()
     {
@@ -89,6 +94,10 @@ public sealed class ExceptionInjectionTests(ModbusSimulatorFixture sim)
         results[0].Value.ShouldBe((ushort)5);
     }
 
+    /// <summary>Verifies that Modbus FC06 writes at injected exception addresses surface the expected OPC UA status codes.</summary>
+    /// <param name="address">The Modbus register address to write.</param>
+    /// <param name="expectedStatus">The expected OPC UA status code.</param>
+    /// <param name="scenario">Scenario description for assertion messages.</param>
     [Theory]
     [InlineData(2000, StatusBadDeviceFailure, "exc 0x04 on FC06 -> BadDeviceFailure (CPU in PROGRAM mode)")]
     [InlineData(2001, StatusBadDeviceFailure, "exc 0x06 on FC06 -> BadDeviceFailure (Server Busy)")]