merge(agent-c): rows 91/95/96 — compile-cache tests on key-scoped delta assertions; Watch/Stop/ExpectTerminated at all 23 fast-tick actor creation sites in the three remaining AuditLog.Tests classes; per-suite xunit maxParallelThreads:4 for the four MSSQL-fixture suites (matches the row-82 semaphore slots) + Test Parallelism Policy doc

tests/ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests/Actors/DeploymentWarmThenGateTests.cs

@@ -248,15 +248,20 @@ public class DeploymentWarmThenGateTests : TestKit, IDisposable
             "BatchTwo", ConfigJson("BatchTwo", sharedCode), "d2", "h2", true);
 
         SiteScriptCompileCache.Clear();
-        Assert.Equal(0, SiteScriptCompileCache.Hits);
+        // Baseline rather than Assert.Equal(0, Hits): Hits is a process-global counter and test
+        // classes outside this collection compile scripts in parallel, so a foreign hit can land
+        // between the Clear() and the read (deferred-work register row 91). Everything below is
+        // asserted as a delta over this baseline.
+        var hitsBefore = SiteScriptCompileCache.Hits;
 
         CreateDeploymentManager();
 
         AwaitAssert(() =>
         {
             // One compile, then repeated hits: the second pre-warm plus both PreStarts.
-            Assert.True(SiteScriptCompileCache.Hits >= 3,
-                $"expected the pre-warmed body to be served from cache, saw {SiteScriptCompileCache.Hits} hits");
+            Assert.True(SiteScriptCompileCache.Hits - hitsBefore >= 3,
+                $"expected the pre-warmed body to be served from cache, saw " +
+                $"{SiteScriptCompileCache.Hits - hitsBefore} hits over baseline {hitsBefore}");
         }, TimeSpan.FromSeconds(20));
     }
 }