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/Cli/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Cli.Tests/ProbeCommandTests.cs

@@ -15,6 +15,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus.Cli.Tests;
 [Trait("Category", "Unit")]
 public sealed class ProbeCommandTests
 {
+    /// <summary>Verifies that ComputeVerdict returns OK when driver state is Healthy and status is Good.</summary>
     [Fact]
     public void ComputeVerdict_returns_OK_when_state_is_Healthy_and_status_is_Good()
     {
@@ -23,6 +24,8 @@ public sealed class ProbeCommandTests
         verdict.ShouldContain("OK");
     }
 
+    /// <summary>Verifies that ComputeVerdict returns FAIL when driver state is not Healthy.</summary>
+    /// <param name="state">The driver state to test.</param>
     [Theory]
     [InlineData(DriverState.Faulted)]
     [InlineData(DriverState.Reconnecting)]
@@ -34,6 +37,8 @@ public sealed class ProbeCommandTests
         verdict.ShouldContain("FAIL");
     }
 
+    /// <summary>Verifies that ComputeVerdict returns FAIL when snapshot status is Bad even if driver is Healthy.</summary>
+    /// <param name="statusCode">The OPC UA status code to test.</param>
     [Theory]
     [InlineData(0x80050000u)] // BadCommunicationError
     [InlineData(0x800A0000u)] // BadTimeout
@@ -50,6 +55,7 @@ public sealed class ProbeCommandTests
         verdict.ShouldContain("FAIL");
     }
 
+    /// <summary>Verifies that ComputeVerdict returns DEGRADED for uncertain status with healthy driver.</summary>
     [Fact]
     public void ComputeVerdict_returns_DEGRADED_for_uncertain_status_with_healthy_driver()
     {