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.TwinCAT.Tests/TwinCATSymbolPathTests.cs

@@ -7,6 +7,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests;
 [Trait("Category", "Unit")]
 public sealed class TwinCATSymbolPathTests
 {
+    /// <summary>Verifies that a single segment global variable parses correctly.</summary>
     [Fact]
     public void Single_segment_global_variable_parses()
     {
@@ -16,6 +17,7 @@ public sealed class TwinCATSymbolPathTests
         p.ToAdsSymbolName().ShouldBe("Counter");
     }
 
+    /// <summary>Verifies that a POU dot-separated variable parses correctly.</summary>
     [Fact]
     public void POU_dot_variable_parses()
     {
@@ -25,6 +27,7 @@ public sealed class TwinCATSymbolPathTests
         p.ToAdsSymbolName().ShouldBe("MAIN.bStart");
     }
 
+    /// <summary>Verifies that a GVL reference parses correctly.</summary>
     [Fact]
     public void GVL_reference_parses()
     {
@@ -34,6 +37,7 @@ public sealed class TwinCATSymbolPathTests
         p.ToAdsSymbolName().ShouldBe("GVL.Counter");
     }
 
+    /// <summary>Verifies that structured member access is split into segments.</summary>
     [Fact]
     public void Structured_member_access_splits()
     {
@@ -42,6 +46,7 @@ public sealed class TwinCATSymbolPathTests
         p.Segments.Select(s => s.Name).ShouldBe(["Motor1", "Status", "Running"]);
     }
 
+    /// <summary>Verifies that array subscripts parse correctly.</summary>
     [Fact]
     public void Array_subscript_parses()
     {
@@ -51,6 +56,7 @@ public sealed class TwinCATSymbolPathTests
         p.ToAdsSymbolName().ShouldBe("Data[5]");
     }
 
+    /// <summary>Verifies that multi-dimensional array subscripts parse correctly.</summary>
     [Fact]
     public void Multi_dim_array_subscript_parses()
     {
@@ -59,6 +65,7 @@ public sealed class TwinCATSymbolPathTests
         p.Segments.Single().Subscripts.ShouldBe([1, 2]);
     }
 
+    /// <summary>Verifies that bit access is captured as a bit index.</summary>
     [Fact]
     public void Bit_access_captured_as_bit_index()
     {
@@ -69,6 +76,7 @@ public sealed class TwinCATSymbolPathTests
         p.ToAdsSymbolName().ShouldBe("Flags.3");
     }
 
+    /// <summary>Verifies that bit access works after a member path.</summary>
     [Fact]
     public void Bit_access_after_member_path()
     {
@@ -78,6 +86,7 @@ public sealed class TwinCATSymbolPathTests
         p.BitIndex.ShouldBe(7);
     }
 
+    /// <summary>Verifies that combined scope, member, subscript, and bit access parses correctly.</summary>
     [Fact]
     public void Combined_scope_member_subscript_bit()
     {
@@ -89,6 +98,8 @@ public sealed class TwinCATSymbolPathTests
         p.ToAdsSymbolName().ShouldBe("MAIN.Motors[0].Status.5");
     }
 
+    /// <summary>Verifies that invalid symbol path shapes return null.</summary>
+    /// <param name="input">The invalid symbol path input to test.</param>
     [Theory]
     [InlineData(null)]
     [InlineData("")]
@@ -108,12 +119,14 @@ public sealed class TwinCATSymbolPathTests
         TwinCATSymbolPath.TryParse(input).ShouldBeNull();
     }
 
+    /// <summary>Verifies that underscore-prefixed identifiers are accepted.</summary>
     [Fact]
     public void Underscore_prefix_idents_accepted()
     {
         TwinCATSymbolPath.TryParse("_internal_var")!.Segments.Single().Name.ShouldBe("_internal_var");
     }
 
+    /// <summary>Verifies that ToAdsSymbolName roundtrips correctly for various symbol formats.</summary>
     [Fact]
     public void ToAdsSymbolName_roundtrips()
     {