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/TwinCATHighFindingsRegressionTests.cs

@@ -19,6 +19,7 @@ public sealed class TwinCATHighFindingsRegressionTests
 
     // ---- Driver.TwinCAT-001 — Reinitialize applies the new config generation ----
 
+    /// <summary>Verifies ReinitializeAsync applies new device configuration at runtime.</summary>
     [Fact]
     public async Task ReinitializeAsync_applies_changed_device_config()
     {
@@ -47,6 +48,7 @@ public sealed class TwinCATHighFindingsRegressionTests
         drv.GetDeviceState("ads://10.0.0.1.1.1:852")!.Options.DeviceName.ShouldBe("Machine2");
     }
 
+    /// <summary>Verifies InitializeAsync applies supplied JSON config over constructor options.</summary>
     [Fact]
     public async Task InitializeAsync_applies_supplied_config_over_constructor_options()
     {
@@ -66,6 +68,7 @@ public sealed class TwinCATHighFindingsRegressionTests
 
     // ---- Driver.TwinCAT-002 — 64-bit + unsigned types map without truncation ----
 
+    /// <summary>Verifies TwinCAT data types map to driver types without truncation of width or signedness.</summary>
     [Fact]
     public void DataType_mapping_preserves_width_and_signedness()
     {
@@ -79,6 +82,7 @@ public sealed class TwinCATHighFindingsRegressionTests
         TwinCATDataType.SInt.ToDriverDataType().ShouldBe(DriverDataType.Int16);
     }
 
+    /// <summary>Verifies 64-bit LInt reads preserve values larger than int.MaxValue.</summary>
     [Fact]
     public async Task LInt_read_round_trips_value_above_int_MaxValue()
     {
@@ -102,6 +106,7 @@ public sealed class TwinCATHighFindingsRegressionTests
 
     // ---- Driver.TwinCAT-007 — concurrent EnsureConnectedAsync creates exactly one client ----
 
+    /// <summary>Verifies concurrent reads on one device create and share exactly one client.</summary>
     [Fact]
     public async Task Concurrent_reads_on_one_device_create_a_single_client()
     {
@@ -124,6 +129,7 @@ public sealed class TwinCATHighFindingsRegressionTests
         factory.Clients[0].ConnectCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies concurrent reads and writes on one device share exactly one client.</summary>
     [Fact]
     public async Task Concurrent_reads_and_writes_share_one_client()
     {
@@ -151,6 +157,7 @@ public sealed class TwinCATHighFindingsRegressionTests
 
     // ---- Driver.TwinCAT-013 — symbol-version-changed routes to IRediscoverable ----
 
+    /// <summary>Verifies TwinCATDriver implements the IRediscoverable interface.</summary>
     [Fact]
     public void TwinCATDriver_implements_IRediscoverable()
     {
@@ -158,6 +165,7 @@ public sealed class TwinCATHighFindingsRegressionTests
         drv.ShouldBeAssignableTo<IRediscoverable>();
     }
 
+    /// <summary>Verifies symbol version change events raise the OnRediscoveryNeeded event.</summary>
     [Fact]
     public async Task Symbol_version_changed_raises_OnRediscoveryNeeded()
     {
@@ -184,6 +192,7 @@ public sealed class TwinCATHighFindingsRegressionTests
         raised!.Reason.ShouldContain("0x0711");
     }
 
+    /// <summary>Verifies status mapper recognizes the symbol version changed error code.</summary>
     [Fact]
     public void StatusMapper_recognises_symbol_version_changed_code()
     {