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/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions.Tests/DriverHealthTests.cs

@@ -17,6 +17,7 @@ public sealed class DriverHealthTests
     ///     all carry a non-null message. The old XML doc "null when state is Healthy" was wrong;
     ///     this test makes the type's actual contract explicit so future doc churn cannot drift.
     /// </summary>
+    /// <param name="state">The driver state to test.</param>
     [Theory]
     [InlineData(DriverState.Unknown)]
     [InlineData(DriverState.Initializing)]
@@ -36,6 +37,7 @@ public sealed class DriverHealthTests
         healthWithoutError.State.ShouldBe(state);
     }
 
+    /// <summary>Verifies that DriverState enum contains all expected members.</summary>
     [Fact]
     public void DriverState_EnumContainsExpectedMembers()
     {