feat(cua): release 0.38.0+artemis.1 with verified shell observation

Upgrade the pinned driver, validate menu and taskbar focus ownership, patch untitled Shell resolution, and remove duplicate scroll scaling. Publish package provenance, verification boundaries and matching marketplace checksum. Go tests, vet, build and byte-level package verification passed.

tests/shell-fixture.ps1

@@ -0,0 +1,51 @@
+param([Parameter(Mandatory = $true)][string]$StateFile)
+$ErrorActionPreference = 'Stop'
+Add-Type -AssemblyName System.Windows.Forms
+Add-Type -AssemblyName System.Drawing
+Add-Type -ReferencedAssemblies System.Windows.Forms,System.Drawing,System.Web.Extensions @'
+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Web.Script.Serialization;
+using System.Windows.Forms;
+using System.Drawing;
+public sealed class ArtemisMenuFixture : Form {
+    [DllImport("user32.dll")] static extern IntPtr CreatePopupMenu();
+    [DllImport("user32.dll", CharSet=CharSet.Unicode)] static extern bool AppendMenuW(IntPtr menu, uint flags, UIntPtr id, string text);
+    [DllImport("user32.dll")] static extern uint TrackPopupMenu(IntPtr menu, uint flags, int x, int y, int reserved, IntPtr owner, IntPtr rect);
+    [DllImport("user32.dll")] static extern bool DestroyMenu(IntPtr menu);
+    readonly string stateFile;
+    int count, attempts;
+    long result = -1;
+    string error = "";
+    public ArtemisMenuFixture(string path) {
+        stateFile = path;
+        Text = "ARTEMIS native menu fixture";
+        Size = new Size(560, 360);
+        StartPosition = FormStartPosition.CenterScreen;
+        var button = new Button { Text="Open native menu", Location=new Point(30,30), Size=new Size(240,55) };
+        button.Click += delegate {
+            var menu = CreatePopupMenu();
+            try {
+                attempts++;
+                Save();
+                if (!AppendMenuW(menu, 0, new UIntPtr(1), "Increment once")) throw new Exception("AppendMenuW failed");
+                result = TrackPopupMenu(menu, 0x100, Left+45, Top+140, 0, Handle, IntPtr.Zero);
+                if (result == 1) count++;
+            } catch (Exception ex) { error = ex.Message; }
+            finally { DestroyMenu(menu); Save(); }
+        };
+        Controls.Add(button);
+        Shown += delegate { Save(); };
+    }
+    void Save() {
+        File.WriteAllText(stateFile, new JavaScriptSerializer().Serialize(new Dictionary<string,object> {
+            {"pid",Process.GetCurrentProcess().Id}, {"hwnd",Handle.ToInt64()}, {"selected_count",count},
+            {"menu_attempts",attempts}, {"menu_result",result}, {"menu_error",error}
+        }));
+    }
+}
+'@
+[System.Windows.Forms.Application]::Run([ArtemisMenuFixture]::new($StateFile))