fix(test): relax exact compile-cache hit-count assertion to >= 1

SiteScriptCompileCache.Hits is a process-global counter; other test classes in
the assembly compile scripts concurrently (not in this serialized collection),
so an exact post-Clear count is non-deterministic under a full-assembly parallel
run. Assert.Same(r1,r2) remains the definitive proof of one shared Roslyn
compile. Integration-surfaced; belongs with plan R2-03 T5/T6.

tests/ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests/Scripts/ScriptCompilationServiceTests.cs

@@ -43,8 +43,13 @@ public class ScriptCompilationServiceTests
         var r2 = _service.Compile("prestart-copy", "return 1 + 1;");
 
         Assert.True(r1.IsSuccess);
-        Assert.Same(r1.CompiledScript, r2.CompiledScript);   // one compile, shared Script<T> (N4)
-        Assert.Equal(1, SiteScriptCompileCache.Hits);
+        Assert.Same(r1.CompiledScript, r2.CompiledScript);   // one compile, shared Script<T> (N4) — the definitive proof
+        // Hits is a process-global counter; other test classes in this assembly compile scripts
+        // concurrently (they are not in this serialized collection), so the exact post-Clear count
+        // is not deterministic under a full-assembly parallel run. The shared-Script<T> assertion
+        // above is the real proof of cache reuse; here we only require the second lookup registered
+        // a hit (>= 1) rather than pinning an exact global count.
+        Assert.True(SiteScriptCompileCache.Hits >= 1);
     }
 
     [Fact]