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.Galaxy.Tests/Runtime/GatewayGalaxyAlarmFeedTests.cs

@@ -17,6 +17,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests.Runtime;
 /// </summary>
 public sealed class GatewayGalaxyAlarmFeedTests
 {
+    /// <summary>Verifies that the feed decodes active alarm snapshots and live transitions.</summary>
     [Fact]
     public async Task Decodes_active_alarm_snapshot_then_live_transition()
     {
@@ -68,6 +69,7 @@ public sealed class GatewayGalaxyAlarmFeedTests
         observed[2].OriginalRaiseTimestampUtc.ShouldBe(raise);
     }
 
+    /// <summary>Verifies that the feed drops transitions with unspecified kind and empty messages.</summary>
     [Fact]
     public async Task Drops_transition_with_unspecified_kind_and_empty_message()
     {
@@ -104,6 +106,7 @@ public sealed class GatewayGalaxyAlarmFeedTests
         observed[0].SeverityBucket.ShouldBe(AlarmSeverity.High);
     }
 
+    /// <summary>Verifies that the feed reopens the stream after a transport fault.</summary>
     [Fact]
     public async Task Reopens_stream_after_a_transport_fault()
     {