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.SiteCallAudit.Tests/TestSupport/StubRepositoryProvider.cs

@@ -41,6 +41,7 @@ internal static class StubRepositoryProvider
     /// False registers the repository unwrapped — for fixtures asserting on call ordering or
     /// identity where the decorator would get in the way.
     /// </param>
+    /// <returns>A service provider whose scopes resolve the configured repository and collaborators.</returns>
     public static ServiceProvider Build(
         ISiteCallAuditRepository repository,
         ISiteEnumerator? siteEnumerator = null,
@@ -107,29 +108,38 @@ internal sealed class SerializingSiteCallAuditRepository : ISiteCallAuditReposit
     private readonly ISiteCallAuditRepository _inner;
     private readonly SemaphoreSlim _gate = new(1, 1);
 
+    /// <summary>Wraps the inner repository so every call is serialized.</summary>
+    /// <param name="inner">The repository to wrap.</param>
     public SerializingSiteCallAuditRepository(ISiteCallAuditRepository inner) => _inner = inner;
 
+    /// <inheritdoc />
     public Task UpsertAsync(SiteCall siteCall, CancellationToken ct = default) =>
         RunAsync(() => _inner.UpsertAsync(siteCall, ct));
 
+    /// <inheritdoc />
     public Task<SiteCall?> GetAsync(TrackedOperationId id, CancellationToken ct = default) =>
         RunAsync(() => _inner.GetAsync(id, ct));
 
+    /// <inheritdoc />
     public Task<IReadOnlyList<SiteCall>> QueryAsync(
         SiteCallQueryFilter filter, SiteCallPaging paging, CancellationToken ct = default) =>
         RunAsync(() => _inner.QueryAsync(filter, paging, ct));
 
+    /// <inheritdoc />
     public Task<int> PurgeTerminalAsync(DateTime olderThanUtc, CancellationToken ct = default) =>
         RunAsync(() => _inner.PurgeTerminalAsync(olderThanUtc, ct));
 
+    /// <inheritdoc />
     public Task<SiteCallKpiSnapshot> ComputeKpisAsync(
         DateTime stuckCutoffUtc, DateTime deliveredSinceUtc, CancellationToken ct = default) =>
         RunAsync(() => _inner.ComputeKpisAsync(stuckCutoffUtc, deliveredSinceUtc, ct));
 
+    /// <inheritdoc />
     public Task<IReadOnlyList<SiteCallSiteKpiSnapshot>> ComputePerSiteKpisAsync(
         DateTime stuckCutoffUtc, DateTime deliveredSinceUtc, CancellationToken ct = default) =>
         RunAsync(() => _inner.ComputePerSiteKpisAsync(stuckCutoffUtc, deliveredSinceUtc, ct));
 
+    /// <inheritdoc />
     public Task<IReadOnlyList<SiteCallNodeKpiSnapshot>> ComputePerNodeKpisAsync(
         DateTime stuckCutoffUtc, DateTime deliveredSinceUtc, CancellationToken ct = default) =>
         RunAsync(() => _inner.ComputePerNodeKpisAsync(stuckCutoffUtc, deliveredSinceUtc, ct));