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/LiteDbConfigCacheTests.cs

@@ -9,6 +9,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
 {
     private readonly string _dbPath = Path.Combine(Path.GetTempPath(), $"otopcua-cache-test-{Guid.NewGuid():N}.db");
 
+    /// <summary>Cleans up the temporary database file.</summary>
     public void Dispose()
     {
         if (File.Exists(_dbPath)) File.Delete(_dbPath);
@@ -22,6 +23,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
         PayloadJson = $"{{\"g\":{gen}}}",
     };
 
+    /// <summary>Verifies that payload is preserved through a write-then-read cycle.</summary>
     [Fact]
     public async Task Roundtrip_preserves_payload()
     {
@@ -35,6 +37,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
         got.PayloadJson.ShouldBe(put.PayloadJson);
     }
 
+    /// <summary>Verifies that GetMostRecentAsync returns the latest generation when multiple exist.</summary>
     [Fact]
     public async Task GetMostRecent_returns_latest_when_multiple_generations_present()
     {
@@ -46,6 +49,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
         got!.GenerationId.ShouldBe(20);
     }
 
+    /// <summary>Verifies that GetMostRecentAsync returns null for an unknown cluster.</summary>
     [Fact]
     public async Task GetMostRecent_returns_null_for_unknown_cluster()
     {
@@ -53,6 +57,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
         (await cache.GetMostRecentAsync("ghost")).ShouldBeNull();
     }
 
+    /// <summary>Verifies that Prune keeps the latest N generations and drops older ones.</summary>
     [Fact]
     public async Task Prune_keeps_latest_N_and_drops_older()
     {
@@ -75,6 +80,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
         count.ShouldBe(10);
     }
 
+    /// <summary>Verifies that writing the same cluster/generation twice replaces rather than duplicates.</summary>
     [Fact]
     public async Task Put_same_cluster_generation_twice_replaces_not_duplicates()
     {
@@ -95,6 +101,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
     // not produce duplicate rows. The original find-then-insert was non-atomic so two racing
     // callers could both observe `existing is null` and both Insert.
     // ------------------------------------------------------------------------------------
+    /// <summary>Verifies that concurrent PutAsync calls for the same cluster and generation do not create duplicates.</summary>
     [Fact]
     public async Task PutAsync_concurrent_for_same_cluster_and_generation_does_not_duplicate()
     {
@@ -122,6 +129,7 @@ public sealed class LiteDbConfigCacheTests : IDisposable
             $"PutAsync must upsert atomically — found {gen42Count} rows for (c-1, gen=42) after 64 concurrent puts");
     }
 
+    /// <summary>Verifies that a corrupted cache file surfaces as LocalConfigCacheCorruptException.</summary>
     [Fact]
     public void Corrupt_file_surfaces_as_LocalConfigCacheCorruptException()
     {