docs(tests): fix CommentChecker findings across tests/ — 13,392 → 0 (repo-wide scan clean)

Comment/XML-doc changes only:
- add summaries to ~10k test methods, fixtures, fakes and helpers
  (+ <param> on theories, <returns> on async Task methods,
  <inheritdoc/> on interface implementations the checker can resolve)
- strip ~2.6k project-tracking references (WP*, P*-*, row-NN, Task N,
  #NN, Component-0NN) from comments, keeping the explanatory text;
  reword false positives in comments only
- real docs on fakes implementing BCL/library interfaces
  (IDisposable, ILogger, IOptionsMonitor, IAsyncLifetime)
- reword the last 5 src/ false positives (CWE-1236, failures-1,
  year-0001, M365)

Only non-comment edits: four one-line nested classes split across lines
so members can carry docs. Build 0 errors / 0 warnings.

tests/ZB.MOM.WW.ScadaBridge.AuditLog.Tests/Site/RingBufferFallbackTests.cs

@@ -6,7 +6,7 @@ using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
 namespace ZB.MOM.WW.ScadaBridge.AuditLog.Tests.Site;
 
 /// <summary>
-/// Bundle B (M2-T3) tests for <see cref="RingBufferFallback"/> — the
+/// Tests for <see cref="RingBufferFallback"/> — the
 /// drop-oldest fallback used by <see cref="FallbackAuditWriter"/> when the
 /// primary SQLite writer is throwing.
 /// </summary>
@@ -23,6 +23,8 @@ public class RingBufferFallbackTests
             target: target);
     }
 
+    /// <summary>Verifies that enqueuing 1025 events into a ring with a capacity of 1024 drops the oldest event and raises the overflow notification exactly once.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Enqueue_1025_Into_1024Cap_Ring_DropsOldest_AndRaisesOverflowOnce()
     {
@@ -51,6 +53,8 @@ public class RingBufferFallbackTests
         Assert.Equal("1024", drained[^1].Target);
     }
 
+    /// <summary>Verifies that draining yields the queued events in FIFO order and then completes once the ring is empty.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DrainAsync_Yields_FIFO_Then_Completes_When_Empty()
     {
@@ -76,6 +80,7 @@ public class RingBufferFallbackTests
         }
     }
 
+    /// <summary>Verifies that enqueuing a single event into a ring with spare capacity succeeds and returns true.</summary>
     [Fact]
     public void TryEnqueue_AllSucceeds_ReturnsTrue()
     {