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.FOCAS.Tests/FocasHandleRecycleTests.cs

@@ -6,6 +6,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests;
 [Trait("Category", "Unit")]
 public sealed class FocasHandleRecycleTests
 {
+    /// <summary>Verifies that the recycle loop disposes clients on interval and reopens fresh ones.</summary>
     [Fact]
     public async Task Recycle_loop_disposes_client_on_interval_reads_reopen_fresh_one()
     {
@@ -38,6 +39,7 @@ public sealed class FocasHandleRecycleTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that the recycle loop stays off when not enabled.</summary>
     [Fact]
     public async Task Recycle_loop_stays_off_when_not_enabled()
     {