fix(app): Campaign LA gate round 2 — session-config launches force the retail UI on

A launcher-spawned client showed the world with NO interface at all -
character screen included. RetailUi rode ACDREAM_RETAIL_UI (the dev-era
opt-in), FromSessionConfig inherited the env parse, and the launcher
strips ACDREAM_* from children by design, so every product launch got
the dev default. A session-config launch IS a product launch: RetailUi
is now forced true on that path; the env flag remains the dev-launch
opt-in. Pinned by the session-config options test with a null env.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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

@@ -59,6 +59,11 @@ public sealed class RuntimeOptionsSessionConfigTests
         Assert.Equal(["PluginA", "PluginB"], options.Plugins);
         Assert.Equal(["/tell x, hi"], options.LoginCommands);
         Assert.Equal(900, options.LoginCommandDelayMs);
+        // Gate round 2: a session-config launch is a product launch — the
+        // retail UI must be ON even though the env func above returns null
+        // for everything (the launcher strips ACDREAM_* from children, so
+        // env inheritance here shipped a client with no interface at all).
+        Assert.True(options.RetailUi);
     }
 
     [Fact]