feat(runtime): own character selection flow

tests/AcDream.App.Tests/Composition/SessionPlayerCompositionTests.cs

@@ -134,6 +134,30 @@ public sealed class SessionPlayerCompositionTests
             "LiveSessionRuntimeFactory.cs")), StringComparison.Ordinal);
     }
 
+    [Fact]
+    public void GraphicalCompositionPausesOnlyWhenCharacterSelectorIsAbsent()
+    {
+        string phase = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "src",
+            "AcDream.App",
+            "Composition",
+            "SessionPlayerComposition.cs"));
+
+        Assert.Contains(
+            "AwaitCharacterSelection:",
+            phase,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "d.Options.LiveCharacterSelector is null",
+            phase,
+            StringComparison.Ordinal);
+        Assert.DoesNotContain(
+            "CharacterList.TrySelectFirstAvailable",
+            phase,
+            StringComparison.Ordinal);
+    }
+
     private sealed class RetryBinding(
         string name,
         List<string> calls,