fix: complete retail parity stability pass

src/AcDream.App/RuntimeOptions.cs

@@ -173,7 +173,13 @@ public sealed record RuntimeOptions(
             // Legacy override for ACDREAM_STREAM_RADIUS. Caller applies it on
             // top of the quality preset's radii. Null when unset or invalid.
             LegacyStreamRadius:  TryParseNonNegativeInt(env("ACDREAM_STREAM_RADIUS")),
-            RetailUi:            IsExactlyOne(env("ACDREAM_RETAIL_UI")),
+            // The retained retail UI is the product's only presentation
+            // stack. It is therefore default-on for every launch path;
+            // literal 0 remains an explicit diagnostic/headless opt-out.
+            RetailUi:            !string.Equals(
+                                     env("ACDREAM_RETAIL_UI"),
+                                     "0",
+                                     StringComparison.Ordinal),
             OpenCharacterCreationOnStart:
                                  IsExactlyOne(env("ACDREAM_OPEN_CHARGEN")),
             AcDir:               NullIfEmpty(env("ACDREAM_AC_DIR")),
@@ -293,14 +299,6 @@ public sealed record RuntimeOptions(
             PreparedAssetEffectiveRecipeVersion =
                 content?.PreparedAssetEffectiveRecipeVersion,
             LiveMode = true,
-            // Campaign LA gate round 2: a session-config launch IS a product
-            // launch — the retail UI is the shipped UI, not a dev option.
-            // ACDREAM_RETAIL_UI remains the opt-in for env-var dev launches,
-            // but the launcher strips ACDREAM_* from children (LA11 isolation),
-            // so inheriting the env default here shipped a client with world
-            // rendering and NO interface at all — the guiSelect flow's
-            // character screen included.
-            RetailUi = true,
             LiveHost = session.Endpoint.Host,
             LivePort = session.Endpoint.Port,
             LiveUser = session.Account,