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.S7.Tests/S7DriverScaffoldTests.cs

@@ -12,6 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Tests;
 [Trait("Category", "Unit")]
 public sealed class S7DriverScaffoldTests
 {
+    /// <summary>Verifies that default options target S7-1500 slot 0 on port 102.</summary>
     [Fact]
     public void Default_options_target_S7_1500_slot_0_on_port_102()
     {
@@ -22,6 +23,7 @@ public sealed class S7DriverScaffoldTests
         opts.Slot.ShouldBe((short)0, "S7-1200/1500 onboard PN ports are slot 0 by convention");
     }
 
+    /// <summary>Verifies that the default probe interval is reasonable for S7 scan cycles.</summary>
     [Fact]
     public void Default_probe_interval_is_reasonable_for_S7_scan_cycle()
     {
@@ -30,6 +32,7 @@ public sealed class S7DriverScaffoldTests
         new S7ProbeOptions().Interval.ShouldBe(TimeSpan.FromSeconds(5));
     }
 
+    /// <summary>Verifies that tag definition defaults to writable with S7 max string length.</summary>
     [Fact]
     public void Tag_definition_defaults_to_writable_with_S7_max_string_length()
     {
@@ -38,6 +41,7 @@ public sealed class S7DriverScaffoldTests
         tag.StringLength.ShouldBe(254, "S7 STRING type max length is 254 chars");
     }
 
+    /// <summary>Verifies that the driver instance reports type and ID before connect.</summary>
     [Fact]
     public void Driver_instance_reports_type_and_id_before_connect()
     {
@@ -48,6 +52,7 @@ public sealed class S7DriverScaffoldTests
         drv.GetHealth().State.ShouldBe(DriverState.Unknown, "health starts Unknown until InitializeAsync runs");
     }
 
+    /// <summary>Verifies that Initialize against unreachable host transitions to Faulted and throws.</summary>
     [Fact]
     public async Task Initialize_against_unreachable_host_transitions_to_Faulted_and_throws()
     {