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.AbLegacy.Cli.Tests/CommandMetadataTests.cs

@@ -30,6 +30,7 @@ public sealed class CommandMetadataTests
 
     // ---------- Driver.AbLegacy.Cli-006 — ProbeCommand --type needs short alias 't' ----------
 
+    /// <summary>Verifies that ProbeCommand --type has short alias -t.</summary>
     [Fact]
     public void ProbeCommand_type_has_short_alias_t()
     {
@@ -38,6 +39,9 @@ public sealed class CommandMetadataTests
         attr.ShortName.ShouldBe('t');
     }
 
+    /// <summary>Verifies that other commands keep the --type short alias as -t.</summary>
+    /// <param name="commandType">The command type to inspect for the --type option.</param>
+    /// <param name="propName">The property name of the --type option on the command.</param>
     [Theory]
     [InlineData(typeof(ReadCommand), nameof(ReadCommand.DataType))]
     [InlineData(typeof(WriteCommand), nameof(WriteCommand.DataType))]
@@ -53,6 +57,7 @@ public sealed class CommandMetadataTests
 
     // ---------- Driver.AbLegacy.Cli-002 — WriteCommand --value help lists full bool alias set ----------
 
+    /// <summary>Verifies that WriteCommand --value help lists the full boolean alias set.</summary>
     [Fact]
     public void WriteCommand_value_help_lists_full_boolean_alias_set()
     {
@@ -68,6 +73,7 @@ public sealed class CommandMetadataTests
 
     // ---------- Driver.AbLegacy.Cli-005 — SubscribeCommand --interval-ms help notes 250ms floor ----------
 
+    /// <summary>Verifies that SubscribeCommand --interval-ms help notes the PollGroupEngine floor.</summary>
     [Fact]
     public void SubscribeCommand_interval_ms_help_notes_PollGroupEngine_floor()
     {