fix: complete retail parity stability pass

tests/AcDream.App.Tests/Configuration/RuntimeOptionsSessionConfigTests.cs

@@ -97,6 +97,33 @@ public sealed class RuntimeOptionsSessionConfigTests
         Assert.Null(options.StatusFilePath);
     }
 
+    [Fact]
+    public void SessionConfigPreservesExplicitRetailUiOptOut()
+    {
+        var config = new SessionConfiguration { Version = 1 };
+        var session = new SessionDescriptor
+        {
+            Id = "no-ui",
+            Endpoint = new SessionEndpointDescriptor { Host = "127.0.0.1", Port = 9000 },
+            Account = "account",
+            Credential = new SessionCredentialDescriptor
+            {
+                Provider = SessionCredentialProviderKind.Environment,
+                Reference = "X",
+            },
+        };
+
+        RuntimeOptions options = RuntimeOptions.FromSessionConfig(
+            "D:\\dat",
+            key => key == "ACDREAM_RETAIL_UI" ? "0" : null,
+            "session.json",
+            config,
+            session,
+            "password");
+
+        Assert.False(options.RetailUi);
+    }
+
     [Fact]
     public void ProcessContentOverridesDatDirectoryAndPreparedAssetPath()
     {