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.AbCip.Tests/AbCipAlarmProjectionTests.cs

@@ -22,6 +22,7 @@ public sealed class AbCipAlarmProjectionTests
             new AbCipStructureMember("In", AbCipDataType.DInt),
         ]);
 
+    /// <summary>Verifies that ALMD structure signature is correctly detected as an alarm.</summary>
     [Fact]
     public void AbCipAlarmDetector_Flags_AlmdSignature_As_Alarm()
     {
@@ -36,6 +37,7 @@ public sealed class AbCipAlarmProjectionTests
         AbCipAlarmDetector.IsAlmd(atomic).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that severity values map correctly to OPC UA alarm severity levels.</summary>
     [Fact]
     public void Severity_Mapping_Matches_OPC_UA_Convention()
     {
@@ -46,6 +48,7 @@ public sealed class AbCipAlarmProjectionTests
         AbCipAlarmProjection.MapSeverity(900).ShouldBe(AlarmSeverity.Critical);
     }
 
+    /// <summary>Verifies that disabled alarm projection returns a valid handle but does not poll.</summary>
     [Fact]
     public async Task FeatureFlag_Off_SubscribeAlarms_Returns_Handle_But_Never_Polls()
     {
@@ -72,6 +75,7 @@ public sealed class AbCipAlarmProjectionTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that enabled alarm projection starts polling and fires raise event on 0-to-1 transition.</summary>
     [Fact]
     public async Task FeatureFlag_On_Subscribe_Starts_Polling_And_Fires_Raise_On_0_to_1()
     {
@@ -115,6 +119,7 @@ public sealed class AbCipAlarmProjectionTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that alarm clear event fires on 1-to-0 transition.</summary>
     [Fact]
     public async Task Clear_Event_Fires_On_1_to_0_Transition()
     {
@@ -155,6 +160,7 @@ public sealed class AbCipAlarmProjectionTests
         await drv.ShutdownAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that unsubscribing stops the alarm poll loop.</summary>
     [Fact]
     public async Task Unsubscribe_Stops_The_Poll_Loop()
     {