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.AbLegacy.Tests/AbLegacyReadWriteTests.cs

@@ -22,6 +22,7 @@ public sealed class AbLegacyReadWriteTests
 
     // ---- 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 AbLegacyReadWriteTests
         snapshots.Single().StatusCode.ShouldBe(AbLegacyStatusMapper.BadNodeIdUnknown);
     }
 
+    /// <summary>Verifies that a successful N-file read returns a Good status.</summary>
     [Fact]
     public async Task Successful_N_file_read_returns_Good_value()
     {
@@ -48,6 +50,7 @@ public sealed class AbLegacyReadWriteTests
         factory.Tags["N7:0"].ReadCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that repeated reads reuse the runtime.</summary>
     [Fact]
     public async Task Repeat_read_reuses_runtime()
     {
@@ -63,6 +66,7 @@ public sealed class AbLegacyReadWriteTests
         factory.Tags["N7:0"].ReadCount.ShouldBe(2);
     }
 
+    /// <summary>Verifies that non-zero libplctag status values map via AbLegacyStatusMapper.</summary>
     [Fact]
     public async Task NonZero_libplctag_status_maps_via_AbLegacyStatusMapper()
     {
@@ -77,6 +81,7 @@ public sealed class AbLegacyReadWriteTests
         snapshots.Single().StatusCode.ShouldBe(AbLegacyStatusMapper.BadNodeIdUnknown);
     }
 
+    /// <summary>Verifies that read exceptions surface as BadCommunicationError.</summary>
     [Fact]
     public async Task Read_exception_surfaces_BadCommunicationError()
     {
@@ -90,6 +95,7 @@ public sealed class AbLegacyReadWriteTests
         drv.GetHealth().State.ShouldBe(DriverState.Degraded);
     }
 
+    /// <summary>Verifies that batched reads preserve order.</summary>
     [Fact]
     public async Task Batched_reads_preserve_order()
     {
@@ -113,6 +119,7 @@ public sealed class AbLegacyReadWriteTests
         snapshots[2].Value.ShouldBe("hello");
     }
 
+    /// <summary>Verifies that read tag creation parameters are composed from device and profile.</summary>
     [Fact]
     public async Task Read_TagCreateParams_composed_from_device_and_profile()
     {
@@ -132,6 +139,7 @@ public sealed class AbLegacyReadWriteTests
 
     // ---- Write ----
 
+    /// <summary>Verifies that a non-writable tag rejects with BadNotWritable.</summary>
     [Fact]
     public async Task Non_writable_tag_rejects_with_BadNotWritable()
     {
@@ -144,6 +152,7 @@ public sealed class AbLegacyReadWriteTests
         results.Single().StatusCode.ShouldBe(AbLegacyStatusMapper.BadNotWritable);
     }
 
+    /// <summary>Verifies that a successful N-file write encodes and flushes the data.</summary>
     [Fact]
     public async Task Successful_N_file_write_encodes_and_flushes()
     {
@@ -159,6 +168,7 @@ public sealed class AbLegacyReadWriteTests
         factory.Tags["N7:0"].WriteCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that bit-within-word write now succeeds via RMW.</summary>
     [Fact]
     public async Task Bit_within_word_write_now_succeeds_via_RMW()
     {
@@ -179,6 +189,7 @@ public sealed class AbLegacyReadWriteTests
         results.Single().StatusCode.ShouldBe(AbLegacyStatusMapper.Good);
     }
 
+    /// <summary>Verifies that write exceptions surface as BadCommunicationError.</summary>
     [Fact]
     public async Task Write_exception_surfaces_BadCommunicationError()
     {
@@ -192,6 +203,7 @@ public sealed class AbLegacyReadWriteTests
         results.Single().StatusCode.ShouldBe(AbLegacyStatusMapper.BadCommunicationError);
     }
 
+    /// <summary>Verifies that batch write preserves order across different outcomes.</summary>
     [Fact]
     public async Task Batch_write_preserves_order_across_outcomes()
     {
@@ -220,6 +232,7 @@ public sealed class AbLegacyReadWriteTests
         results[2].StatusCode.ShouldBe(AbLegacyStatusMapper.BadNodeIdUnknown);
     }
 
+    /// <summary>Verifies that cancellation propagates through the driver.</summary>
     [Fact]
     public async Task Cancellation_propagates()
     {
@@ -236,6 +249,7 @@ public sealed class AbLegacyReadWriteTests
             () => drv.ReadAsync(["X"], CancellationToken.None));
     }
 
+    /// <summary>Verifies that ShutdownAsync disposes all runtimes.</summary>
     [Fact]
     public async Task ShutdownAsync_disposes_runtimes()
     {
@@ -252,6 +266,11 @@ public sealed class AbLegacyReadWriteTests
 
     private sealed class RmwThrowingFake(AbLegacyTagCreateParams p) : FakeAbLegacyTag(p)
     {
+        /// <summary>Encodes a value for the tag, throwing for unsupported bit-within-word RMW operations.</summary>
+        /// <param name="type">The data type of the tag.</param>
+        /// <param name="bitIndex">Optional bit index within a word.</param>
+        /// <param name="value">The value to encode.</param>
+        /// <inheritdoc />
         public override void EncodeValue(AbLegacyDataType type, int? bitIndex, object? value)
         {
             if (type == AbLegacyDataType.Bit && bitIndex is not null)