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/FocasCapabilityTests.cs

@@ -11,6 +11,7 @@ public sealed class FocasCapabilityTests
 {
     // ---- ITagDiscovery ----
 
+    /// <summary>Verifies that DiscoverAsync emits pre-declared tags.</summary>
     [Fact]
     public async Task DiscoverAsync_emits_pre_declared_tags()
     {
@@ -39,6 +40,7 @@ public sealed class FocasCapabilityTests
 
     // ---- ISubscribable ----
 
+    /// <summary>Verifies that the initial subscription poll raises an OnDataChange event.</summary>
     [Fact]
     public async Task Subscribe_initial_poll_raises_OnDataChange()
     {
@@ -64,6 +66,7 @@ public sealed class FocasCapabilityTests
         await drv.UnsubscribeAsync(handle, CancellationToken.None);
     }
 
+    /// <summary>Verifies that ShutdownAsync cancels active subscriptions.</summary>
     [Fact]
     public async Task ShutdownAsync_cancels_active_subscriptions()
     {
@@ -93,6 +96,7 @@ public sealed class FocasCapabilityTests
 
     // ---- IHostConnectivityProbe ----
 
+    /// <summary>Verifies that GetHostStatuses returns one entry per device.</summary>
     [Fact]
     public async Task GetHostStatuses_returns_entry_per_device()
     {
@@ -110,6 +114,7 @@ public sealed class FocasCapabilityTests
         drv.GetHostStatuses().Count.ShouldBe(2);
     }
 
+    /// <summary>Verifies that the probe transitions to Running on successful connection.</summary>
     [Fact]
     public async Task Probe_transitions_to_Running_on_success()
     {
@@ -136,6 +141,7 @@ public sealed class FocasCapabilityTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that the probe transitions to Stopped on connection failure.</summary>
     [Fact]
     public async Task Probe_transitions_to_Stopped_on_failure()
     {
@@ -164,6 +170,7 @@ public sealed class FocasCapabilityTests
 
     // ---- IPerCallHostResolver ----
 
+    /// <summary>Verifies that ResolveHost returns the declared device for a known tag.</summary>
     [Fact]
     public async Task ResolveHost_returns_declared_device_for_known_tag()
     {
@@ -187,6 +194,7 @@ public sealed class FocasCapabilityTests
         drv.ResolveHost("B").ShouldBe("focas://10.0.0.6:8193");
     }
 
+    /// <summary>Verifies that ResolveHost falls back to the first device for unknown tags.</summary>
     [Fact]
     public async Task ResolveHost_falls_back_to_first_device_for_unknown()
     {
@@ -200,6 +208,7 @@ public sealed class FocasCapabilityTests
         drv.ResolveHost("missing").ShouldBe("focas://10.0.0.5:8193");
     }
 
+    /// <summary>Verifies that ResolveHost falls back to the driver instance ID when no devices are configured.</summary>
     [Fact]
     public async Task ResolveHost_falls_back_to_DriverInstanceId_when_no_devices()
     {
@@ -218,24 +227,49 @@ public sealed class FocasCapabilityTests
             await Task.Delay(20);
     }
 
+    /// <summary>Test double that records IAddressSpaceBuilder calls.</summary>
     private sealed class RecordingBuilder : IAddressSpaceBuilder
     {
+        /// <summary>Gets the list of recorded folder calls.</summary>
         public List<(string BrowseName, string DisplayName)> Folders { get; } = new();
+        /// <summary>Gets the list of recorded variable calls.</summary>
         public List<(string BrowseName, DriverAttributeInfo Info)> Variables { get; } = new();
 
+        /// <summary>Records a folder call.</summary>
+        /// <param name="browseName">The browse name of the folder.</param>
+        /// <param name="displayName">The display name of the folder.</param>
+        /// <returns>This builder for chaining.</returns>
         public IAddressSpaceBuilder Folder(string browseName, string displayName)
         { Folders.Add((browseName, displayName)); return this; }
 
+        /// <summary>Records a variable call.</summary>
+        /// <param name="browseName">The browse name of the variable.</param>
+        /// <param name="displayName">The display name of the variable.</param>
+        /// <param name="info">The driver attribute information.</param>
+        /// <returns>A variable handle for the recorded variable.</returns>
         public IVariableHandle Variable(string browseName, string displayName, DriverAttributeInfo info)
         { Variables.Add((browseName, info)); return new Handle(info.FullName); }
 
+        /// <summary>Records a property call (no-op).</summary>
+        /// <param name="_">The property name (unused).</param>
+        /// <param name="__">The property data type (unused).</param>
+        /// <param name="___">The property value (unused).</param>
         public void AddProperty(string _, DriverDataType __, object? ___) { }
 
         private sealed class Handle(string fullRef) : IVariableHandle
         {
+            /// <summary>Gets the full reference.</summary>
             public string FullReference => fullRef;
+            /// <summary>Marks as alarm condition.</summary>
+            /// <param name="info">The alarm condition information.</param>
+            /// <returns>An alarm condition sink.</returns>
             public IAlarmConditionSink MarkAsAlarmCondition(AlarmConditionInfo info) => new NullSink();
         }
-        private sealed class NullSink : IAlarmConditionSink { public void OnTransition(AlarmEventArgs args) { } }
+        /// <summary>Null alarm condition sink.</summary>
+        private sealed class NullSink : IAlarmConditionSink {
+            /// <summary>Handles transition (no-op).</summary>
+            /// <param name="args">The alarm event arguments (unused).</param>
+            public void OnTransition(AlarmEventArgs args) { }
+        }
     }
 }