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/FocasPmcBitRmwTests.cs

@@ -15,8 +15,10 @@ public sealed class FocasPmcBitRmwTests
     /// </summary>
     private sealed class PmcRmwFake : FakeFocasClient
     {
+        /// <summary>Gets the simulated PMC byte storage.</summary>
         public byte[] PmcBytes { get; } = new byte[1024];
 
+        /// <inheritdoc />
         public override Task<(object? value, uint status)> ReadAsync(
             FocasAddress address, FocasDataType type, CancellationToken ct)
         {
@@ -27,6 +29,7 @@ public sealed class FocasPmcBitRmwTests
             return base.ReadAsync(address, type, ct);
         }
 
+        /// <inheritdoc />
         public override Task<uint> WriteAsync(
             FocasAddress address, FocasDataType type, object? value, CancellationToken ct)
         {
@@ -62,6 +65,7 @@ public sealed class FocasPmcBitRmwTests
         return (drv, fake);
     }
 
+    /// <summary>Verifies that a bit set operation surfaces as Good status and flips the bit.</summary>
     [Fact]
     public async Task Bit_set_surfaces_as_Good_status_and_flips_bit()
     {
@@ -76,6 +80,7 @@ public sealed class FocasPmcBitRmwTests
         fake.PmcBytes[100].ShouldBe((byte)0b0000_1001);
     }
 
+    /// <summary>Verifies that clearing a bit preserves other bits.</summary>
     [Fact]
     public async Task Bit_clear_preserves_other_bits()
     {
@@ -89,6 +94,7 @@ public sealed class FocasPmcBitRmwTests
         fake.PmcBytes[100].ShouldBe((byte)0b1111_0111);
     }
 
+    /// <summary>Verifies that subsequent bit sets in the same byte compose correctly.</summary>
     [Fact]
     public async Task Subsequent_bit_sets_in_same_byte_compose_correctly()
     {
@@ -105,6 +111,7 @@ public sealed class FocasPmcBitRmwTests
         fake.PmcBytes[100].ShouldBe((byte)0xFF);
     }
 
+    /// <summary>Verifies that bit writes to different bytes do not contend.</summary>
     [Fact]
     public async Task Bit_write_to_different_bytes_does_not_contend()
     {