feat(launcher): stabilize prepared content updates

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

@@ -137,6 +137,56 @@ public sealed class RuntimeOptionsSessionConfigTests
             options.PreparedAssetPath);
     }
 
+    [Fact]
+    public void ProcessContentCarriesOptionalOverlayAndBothRecipeIdentities()
+    {
+        var config = new SessionConfiguration
+        {
+            Version = 1,
+            Process = new SessionProcessSettings
+            {
+                Content = new SessionContentDescriptor
+                {
+                    DatDirectory = "D:\\dats",
+                    PreparedAssetPath = "D:\\content\\acdream.pak",
+                    PreparedAssetOverlayPath =
+                        "D:\\content\\acdream-update-5.pak",
+                    PreparedAssetBaseRecipeVersion = 4,
+                    PreparedAssetEffectiveRecipeVersion = 5,
+                },
+            },
+        };
+        var session = new SessionDescriptor
+        {
+            Id = "overlay-session",
+            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:\\dats",
+            _ => null,
+            "session.json",
+            config,
+            session,
+            "password");
+
+        Assert.Equal(
+            "D:\\content\\acdream-update-5.pak",
+            options.PreparedAssetOverlayPath);
+        Assert.Equal(4u, options.PreparedAssetBaseRecipeVersion);
+        Assert.Equal(5u, options.PreparedAssetEffectiveRecipeVersion);
+    }
+
     [Fact]
     public void EnvironmentFlowLeavesEveryNewFieldAtItsNothingConfiguredDefault()
     {
@@ -149,5 +199,8 @@ public sealed class RuntimeOptionsSessionConfigTests
         Assert.Null(options.Plugins);
         Assert.Empty(options.LoginCommands);
         Assert.Equal(500, options.LoginCommandDelayMs);
+        Assert.Null(options.PreparedAssetOverlayPath);
+        Assert.Null(options.PreparedAssetBaseRecipeVersion);
+        Assert.Null(options.PreparedAssetEffectiveRecipeVersion);
     }
 }