fix(scripts): memoize missing-assembly resolution on the design-time compile gate

src/ZB.MOM.WW.ScadaBridge.ScriptAnalysis/RoslynScriptCompiler.cs

@@ -65,6 +65,7 @@ public static class RoslynScriptCompiler
 
             var options = ScriptOptions.Default
                 .WithReferences(references)
+                .WithMetadataResolver(CachingScriptMetadataResolver.Instance)
                 .WithImports(imports);
 
             var script = CSharpScript.Create<object?>(code, options, globalsType);

tests/ZB.MOM.WW.ScadaBridge.ScriptAnalysis.Tests/RoslynScriptCompilerTests.cs

@@ -138,4 +138,11 @@ public class RoslynScriptCompilerTests
         var diagnostics = RoslynScriptCompiler.Compile(code, typeof(ScriptCompileSurface));
         Assert.Empty(diagnostics);
     }
+
+    [Fact]
+    public void Compile_TwiceWithSharedResolver_StillCompilesCleanly()
+    {
+        Assert.Empty(RoslynScriptCompiler.Compile("return 1 + 1;"));
+        Assert.Empty(RoslynScriptCompiler.Compile("return 2 + 2;"));
+    }
 }