feat(linux): gate graphical backends and capabilities

tests/AcDream.App.Tests/Studio/StudioWindowTests.cs

@@ -5,6 +5,24 @@ namespace AcDream.App.Tests.Studio;
 
 public class StudioWindowTests
 {
+    [Fact]
+    public void FrameCloseGate_defersCloseUntilFrameCompletion()
+    {
+        var gate = new StudioFrameCloseGate();
+        int closeCount = 0;
+
+        gate.Request();
+
+        Assert.True(gate.IsRequested);
+        Assert.Equal(0, closeCount);
+
+        gate.CompleteFrame(() => closeCount++);
+        gate.CompleteFrame(() => closeCount++);
+
+        Assert.False(gate.IsRequested);
+        Assert.Equal(1, closeCount);
+    }
+
     [Fact]
     public void ParseMockup_doesNotDefaultToSinglePanelLayout()
     {
@@ -16,6 +34,22 @@ public class StudioWindowTests
         Assert.Null(opts.MarkupPath);
     }
 
+    [Fact]
+    public void ParseCapabilitySmokeOptions()
+    {
+        var opts = StudioOptions.Parse(
+        [
+            @"C:\fake-dats",
+            "--mockup",
+            "--capability-report",
+            "report.json",
+            "--audio-smoke",
+        ]);
+
+        Assert.Equal("report.json", opts.CapabilityReportPath);
+        Assert.True(opts.AudioSmoke);
+    }
+
     [Fact]
     public void NormalizeSinglePanelRoot_movesDatPanelToCanvasOrigin()
     {