Initial commit

sidecar/Gumps/GumpExtractor.cs

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+namespace ArtificersScrollwork.Sidecar.Gumps;
+
+/// <summary>
+/// Extracts Add* calls from Gump constructors and produces a GumpDrawList.
+/// TODO (Phase 4): Full implementation.
+/// </summary>
+public class GumpExtractor
+{
+    // Phase 4 implementation placeholder.
+    // Will walk the constructor body of a Gump class,
+    // map Add* method calls to DrawCall records,
+    // and detect dynamic regions (loop/conditional bodies).
+}