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/FocasReadWriteTests.cs

@@ -22,6 +22,7 @@ public sealed class FocasReadWriteTests
 
     // ---- Read ----
 
+    /// <summary>Verifies that an unknown reference maps to BadNodeIdUnknown.</summary>
     [Fact]
     public async Task Unknown_reference_maps_to_BadNodeIdUnknown()
     {
@@ -32,6 +33,7 @@ public sealed class FocasReadWriteTests
         snapshots.Single().StatusCode.ShouldBe(FocasStatusMapper.BadNodeIdUnknown);
     }
 
+    /// <summary>Verifies that a successful PMC read returns a Good status value.</summary>
     [Fact]
     public async Task Successful_PMC_read_returns_Good_value()
     {
@@ -45,6 +47,7 @@ public sealed class FocasReadWriteTests
         snapshots.Single().Value.ShouldBe((sbyte)5);
     }
 
+    /// <summary>Verifies that parameter reads route through the FocasAddress Parameter kind.</summary>
     [Fact]
     public async Task Parameter_read_routes_through_FocasAddress_Parameter_kind()
     {
@@ -58,6 +61,7 @@ public sealed class FocasReadWriteTests
         snapshots.Single().Value.ShouldBe(1500);
     }
 
+    /// <summary>Verifies that macro reads route through the FocasAddress Macro kind.</summary>
     [Fact]
     public async Task Macro_read_routes_through_FocasAddress_Macro_kind()
     {
@@ -70,6 +74,7 @@ public sealed class FocasReadWriteTests
         snapshots.Single().Value.ShouldBe(3.14159);
     }
 
+    /// <summary>Verifies that repeated reads reuse the connection.</summary>
     [Fact]
     public async Task Repeat_read_reuses_connection()
     {
@@ -85,6 +90,7 @@ public sealed class FocasReadWriteTests
         factory.Clients[0].ConnectCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that FOCAS error statuses map correctly via the status mapper.</summary>
     [Fact]
     public async Task FOCAS_error_status_maps_via_status_mapper()
     {
@@ -102,6 +108,7 @@ public sealed class FocasReadWriteTests
         snapshots.Single().StatusCode.ShouldBe(FocasStatusMapper.BadNodeIdUnknown);
     }
 
+    /// <summary>Verifies that a read exception surfaces BadCommunicationError.</summary>
     [Fact]
     public async Task Read_exception_surfaces_BadCommunicationError()
     {
@@ -115,6 +122,7 @@ public sealed class FocasReadWriteTests
         drv.GetHealth().State.ShouldBe(DriverState.Degraded);
     }
 
+    /// <summary>Verifies that a connection failure disposes the client and surfaces BadCommunicationError.</summary>
     [Fact]
     public async Task Connect_failure_disposes_client_and_surfaces_BadCommunicationError()
     {
@@ -128,6 +136,7 @@ public sealed class FocasReadWriteTests
         factory.Clients[0].DisposeCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that batched reads preserve order across different address areas.</summary>
     [Fact]
     public async Task Batched_reads_preserve_order_across_areas()
     {
@@ -154,6 +163,7 @@ public sealed class FocasReadWriteTests
 
     // ---- Write ----
 
+    /// <summary>Verifies that a non-writable tag write is rejected with BadNotWritable.</summary>
     [Fact]
     public async Task Non_writable_tag_rejected_with_BadNotWritable()
     {
@@ -166,6 +176,7 @@ public sealed class FocasReadWriteTests
         results.Single().StatusCode.ShouldBe(FocasStatusMapper.BadNotWritable);
     }
 
+    /// <summary>Verifies that a successful write logs the address, type, and value.</summary>
     [Fact]
     public async Task Successful_write_logs_address_type_value()
     {
@@ -183,6 +194,7 @@ public sealed class FocasReadWriteTests
         write.value.ShouldBe((short)1800);
     }
 
+    /// <summary>Verifies that write status codes map correctly via the FocasStatusMapper.</summary>
     [Fact]
     public async Task Write_status_code_maps_via_FocasStatusMapper()
     {
@@ -201,6 +213,7 @@ public sealed class FocasReadWriteTests
         results.Single().StatusCode.ShouldBe(FocasStatusMapper.BadNotWritable);
     }
 
+    /// <summary>Verifies that batched writes preserve order across different outcomes.</summary>
     [Fact]
     public async Task Batch_write_preserves_order_across_outcomes()
     {
@@ -229,6 +242,7 @@ public sealed class FocasReadWriteTests
         results[2].StatusCode.ShouldBe(FocasStatusMapper.BadNodeIdUnknown);
     }
 
+    /// <summary>Verifies that cancellation signals are propagated.</summary>
     [Fact]
     public async Task Cancellation_propagates()
     {
@@ -245,6 +259,7 @@ public sealed class FocasReadWriteTests
             () => drv.ReadAsync(["X"], CancellationToken.None));
     }
 
+    /// <summary>Verifies that ShutdownAsync disposes the client.</summary>
     [Fact]
     public async Task ShutdownAsync_disposes_client()
     {