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.IntegrationTests/Series/WireBackendTests.cs

@@ -20,10 +20,15 @@ public sealed class WireBackendTests
 {
     private readonly FocasSimFixture _fx;
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WireBackendTests"/> class.
+    /// </summary>
+    /// <param name="fx">The FOCAS simulator fixture.</param>
     public WireBackendTests(FocasSimFixture fx) => _fx = fx;
 
     private const string DeviceHost = "focas://127.0.0.1:8193";
 
+    /// <summary>Verifies that identity axes and dynamic data populate via the wire backend.</summary>
     [Fact]
     public async Task Identity_axes_and_dynamic_populate_via_wire_backend()
     {
@@ -80,6 +85,7 @@ public sealed class WireBackendTests
         }
     }
 
+    /// <summary>Verifies that program and operation mode data populate via the wire backend.</summary>
     [Fact]
     public async Task Program_and_operation_mode_populate_via_wire_backend()
     {
@@ -144,6 +150,7 @@ public sealed class WireBackendTests
         }
     }
 
+    /// <summary>Verifies that timer data populates via the wire backend.</summary>
     [Fact]
     public async Task Timers_populate_via_wire_backend()
     {
@@ -201,6 +208,7 @@ public sealed class WireBackendTests
         }
     }
 
+    /// <summary>Verifies that spindle load and max RPM data populate via the wire backend.</summary>
     [Fact]
     public async Task Spindle_load_and_max_rpm_populate_via_wire_backend()
     {