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/FocasLowFindingsTests.cs

@@ -20,6 +20,9 @@ public sealed class FocasLowFindingsTests
 {
     // ---- Driver.FOCAS-008 — parsed FocasAddress cached at init ----
 
+    /// <summary>
+    /// Verifies that ReadAsync uses cached FocasAddress when tag definition has a malformed address after init.
+    /// </summary>
     [Fact]
     public async Task ReadAsync_uses_cached_FocasAddress_when_tag_definition_has_a_malformed_address_after_init()
     {
@@ -53,6 +56,9 @@ public sealed class FocasLowFindingsTests
             .ShouldBeTrue("ReadAsync must reuse the FocasAddress parsed at init, not re-parse per read");
     }
 
+    /// <summary>
+    /// Verifies that WriteAsync also uses cached FocasAddress.
+    /// </summary>
     [Fact]
     public async Task WriteAsync_uses_cached_FocasAddress_too()
     {
@@ -90,6 +96,9 @@ public sealed class FocasLowFindingsTests
 
     // ---- Driver.FOCAS-009 — Probe.Timeout applies to ProbeAsync ----
 
+    /// <summary>
+    /// Verifies that ProbeLoop cancels a slow ProbeAsync at Probe Timeout.
+    /// </summary>
     [Fact]
     public async Task ProbeLoop_cancels_a_slow_ProbeAsync_at_Probe_Timeout()
     {
@@ -130,6 +139,11 @@ public sealed class FocasLowFindingsTests
 
     // ---- Driver.FOCAS-010 — operation-mode → text mapping is consolidated ----
 
+    /// <summary>
+    /// Verifies that OpMode ToText yields the same label in both namespaces.
+    /// </summary>
+    /// <param name="code">The operation mode code to test.</param>
+    /// <param name="expected">The expected text representation.</param>
     [Theory]
     [InlineData(0, "MDI")]
     [InlineData(1, "AUTO")]
@@ -149,6 +163,9 @@ public sealed class FocasLowFindingsTests
         ((FocasOperationMode)(short)code).ToText().ShouldBe(expected);
     }
 
+    /// <summary>
+    /// Verifies that OpMode ToText fallback label is consistent.
+    /// </summary>
     [Fact]
     public void OpMode_ToText_fallback_label_is_consistent()
     {
@@ -162,6 +179,9 @@ public sealed class FocasLowFindingsTests
 
     // ---- Driver.FOCAS-011 — FocasAlarmType constants typed as short ----
 
+    /// <summary>
+    /// Verifies that FocasAlarmType constants are typed as short.
+    /// </summary>
     [Fact]
     public void FocasAlarmType_constants_are_typed_short()
     {
@@ -184,6 +204,7 @@ public sealed class FocasLowFindingsTests
 
     private sealed class CapturingFakeFocasClient(List<FocasAddress> captured) : FakeFocasClient
     {
+        /// <inheritdoc />
         public override Task<(object? value, uint status)> ReadAsync(
             FocasAddress address, FocasDataType type, CancellationToken ct)
         {
@@ -191,6 +212,7 @@ public sealed class FocasLowFindingsTests
             return base.ReadAsync(address, type, ct);
         }
 
+        /// <inheritdoc />
         public override Task<uint> WriteAsync(
             FocasAddress address, FocasDataType type, object? value, CancellationToken ct)
         {
@@ -201,6 +223,7 @@ public sealed class FocasLowFindingsTests
 
     private sealed class HangingProbeFakeClient(TaskCompletionSource cancelledSignal) : FakeFocasClient
     {
+        /// <inheritdoc />
         public override async Task<bool> ProbeAsync(CancellationToken ct)
         {
             try