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.ConfigurationDatabase.Tests/EphemeralEncryptionFallbackTests.cs

@@ -7,7 +7,7 @@ using ZB.MOM.WW.ScadaBridge.ConfigurationDatabase;
 namespace ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Tests;
 
 /// <summary>
-/// Regression guard for ConfigurationDatabase-013: a <see cref="ScadaBridgeDbContext"/>
+/// Regression guard: a <see cref="ScadaBridgeDbContext"/>
 /// constructed without an explicit Data Protection provider (the single-argument
 /// constructor) must NOT silently encrypt secret columns with a throwaway ephemeral
 /// key — that would persist ciphertext that becomes permanently undecryptable on the
@@ -22,6 +22,8 @@ public class EphemeralEncryptionFallbackTests
             .ConfigureWarnings(w => w.Ignore(RelationalEventId.PendingModelChangesWarning))
             .Options;
 
+    /// <summary>Verifies that writing a secret column through the single-argument constructor fails fast and does not persist throwaway ciphertext.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SingleArgConstructor_WritingSecretColumn_FailsFast_DoesNotPersistThrowawayCiphertext()
     {
@@ -44,6 +46,8 @@ public class EphemeralEncryptionFallbackTests
         Assert.Contains("Data Protection", ex.Message);
     }
 
+    /// <summary>Verifies that writing a non-secret column through the single-argument constructor succeeds.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SingleArgConstructor_WritingNonSecretColumn_Succeeds()
     {
@@ -61,6 +65,8 @@ public class EphemeralEncryptionFallbackTests
         Assert.True(ext.Id > 0);
     }
 
+    /// <summary>Verifies that writing a secret column through the provider constructor still succeeds.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ProviderConstructor_WritingSecretColumn_StillSucceeds()
     {