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/Core/ZB.MOM.WW.OtOpcUa.Configuration.Tests/GenerationSealedCacheTests.cs

@@ -9,6 +9,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
 {
     private readonly string _root = Path.Combine(Path.GetTempPath(), $"otopcua-sealed-{Guid.NewGuid():N}");
 
+    /// <summary>Cleans up temporary directory after test execution.</summary>
     public void Dispose()
     {
         try
@@ -31,6 +32,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
             PayloadJson = payload,
         };
 
+    /// <summary>Verifies that reading a snapshot on first boot with no existing snapshot throws.</summary>
     [Fact]
     public async Task FirstBoot_NoSnapshot_ReadThrows()
     {
@@ -40,6 +42,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
             () => cache.ReadCurrentAsync("cluster-a"));
     }
 
+    /// <summary>Verifies that sealed snapshots can be read back correctly.</summary>
     [Fact]
     public async Task SealThenRead_RoundTrips()
     {
@@ -54,6 +57,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
         read.PayloadJson.ShouldBe("{\"hello\":\"world\"}");
     }
 
+    /// <summary>Verifies that sealed files are marked read-only on disk.</summary>
     [Fact]
     public async Task SealedFile_IsReadOnly_OnDisk()
     {
@@ -66,6 +70,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
         attrs.HasFlag(FileAttributes.ReadOnly).ShouldBeTrue("sealed file must be read-only");
     }
 
+    /// <summary>Verifies that the current generation pointer advances when a new generation is sealed.</summary>
     [Fact]
     public async Task SealingTwoGenerations_PointerAdvances_ToLatest()
     {
@@ -78,6 +83,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
         read.GenerationId.ShouldBe(2);
     }
 
+    /// <summary>Verifies that prior generation files are preserved after a new seal.</summary>
     [Fact]
     public async Task PriorGenerationFile_Survives_AfterNewSeal()
     {
@@ -90,6 +96,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
         File.Exists(Path.Combine(_root, "cluster-a", "2.db")).ShouldBeTrue();
     }
 
+    /// <summary>Verifies that reading a corrupt sealed file fails safely.</summary>
     [Fact]
     public async Task CorruptSealedFile_ReadFailsClosed()
     {
@@ -105,6 +112,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
             () => cache.ReadCurrentAsync("cluster-a"));
     }
 
+    /// <summary>Verifies that reading with a missing sealed file fails safely.</summary>
     [Fact]
     public async Task MissingSealedFile_ReadFailsClosed()
     {
@@ -120,6 +128,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
             () => cache.ReadCurrentAsync("cluster-a"));
     }
 
+    /// <summary>Verifies that reading with a corrupt pointer file fails safely.</summary>
     [Fact]
     public async Task CorruptPointerFile_ReadFailsClosed()
     {
@@ -133,6 +142,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
             () => cache.ReadCurrentAsync("cluster-a"));
     }
 
+    /// <summary>Verifies that sealing the same generation twice is idempotent.</summary>
     [Fact]
     public async Task SealSameGenerationTwice_IsIdempotent()
     {
@@ -144,6 +154,7 @@ public sealed class GenerationSealedCacheTests : IDisposable
         read.PayloadJson.ShouldBe("{\"sample\":true}", "sealed file is immutable; second seal no-ops");
     }
 
+    /// <summary>Verifies that independent clusters do not interfere with each other.</summary>
     [Fact]
     public async Task IndependentClusters_DoNotInterfere()
     {