Resolve all 46 low-severity architecture review findings

tests/ZB.MOM.WW.ScadaBridge.AuditLog.Tests/Central/AuditLogPurgeActorTests.cs

@@ -62,7 +62,7 @@ public class AuditLogPurgeActorTests : TestKit, IClassFixture<MsSqlMigrationFixt
         // M5.5 (T3): records every per-channel purge call as
         // (channel, threshold, batchSize) so tests can assert which channels the
         // actor chose to purge and with what window.
-        public List<(string Channel, DateTime Threshold, int BatchSize)> ChannelPurges { get; } = new();
+        public List<(string Channel, DateTime Threshold, int BatchSize, int MaxRows)> ChannelPurges { get; } = new();
         public Func<string, long> RowsPerChannel { get; set; } = _ => 0L;
 
         // The actor enumerator returns whichever list is configured here.
@@ -96,9 +96,9 @@ public class AuditLogPurgeActorTests : TestKit, IClassFixture<MsSqlMigrationFixt
         }
 
         public Task<long> PurgeChannelOlderThanAsync(
-            string channel, DateTime threshold, int batchSize, TimeSpan? commandTimeout = null, CancellationToken ct = default)
+            string channel, DateTime threshold, int batchSize, TimeSpan? commandTimeout = null, CancellationToken ct = default, int maxRows = 50_000)
         {
-            ChannelPurges.Add((channel, threshold, batchSize));
+            ChannelPurges.Add((channel, threshold, batchSize, maxRows));
             ChannelTimeouts.Add(commandTimeout);
             return Task.FromResult(RowsPerChannel(channel));
         }
@@ -479,6 +479,7 @@ public class AuditLogPurgeActorTests : TestKit, IClassFixture<MsSqlMigrationFixt
         var repo = new RecordingRepo { Boundaries = new List<DateTime>() };
         var purgeOptions = FastTickOptions();
         purgeOptions.ChannelPurgeBatchSizeConfigured = 1234;
+        purgeOptions.MaxPurgedRowsPerChannelPerTick = 4321;
 
         // Build the options OUTSIDE the Props expression tree — a collection/dictionary
         // initializer is not legal inside an expression-tree lambda (CS8074).
@@ -505,6 +506,7 @@ public class AuditLogPurgeActorTests : TestKit, IClassFixture<MsSqlMigrationFixt
 
         var purge = repo.ChannelPurges.First(p => p.Channel == "ApiOutbound");
         Assert.Equal(1234, purge.BatchSize);
+        Assert.Equal(4321, purge.MaxRows);
 
         var expected = DateTime.UtcNow - TimeSpan.FromDays(30);
         Assert.True(