1.4 Resolution value type

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/FrameProcessor/Domain/Resolution.cs

@@ -0,0 +1,11 @@
+namespace FrameProcessor.Domain;
+
+public sealed record Resolution(int Width, int Height)
+{
+    public Resolution ForOrientation(Orientation orientation) => orientation switch
+    {
+        Orientation.Landscape => this,
+        Orientation.Portrait => new Resolution(Height, Width),
+        _ => throw new ArgumentOutOfRangeException(nameof(orientation), orientation, null),
+    };
+}