fix(computer-use-mcp): harden desktop runtime cleanup (#1746)

---------

Co-authored-by-agent: Antigravity <antigravity@gemini.com>

services/computer-use-mcp/src/executors/macos-local.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from 'vitest'
+
+import { moveAndClickScript } from './macos-local'
+
+describe('moveAndClickScript', () => {
+  it('saves and restores the real macOS cursor around CGEvent clicks', () => {
+    const source = moveAndClickScript()
+
+    const saveCursorIndex = source.indexOf('let originalCursorLocation = CGEvent(source: nil)?.location')
+    const restoreCursorIndex = source.indexOf('CGWarpMouseCursorPosition(savedCursorLocation)')
+    const moveTraceIndex = source.indexOf('for point in trace')
+    const clickIndex = source.indexOf('down.post(tap: .cghidEventTap)')
+
+    expect(saveCursorIndex).toBeGreaterThanOrEqual(0)
+    expect(restoreCursorIndex).toBeGreaterThanOrEqual(0)
+    expect(moveTraceIndex).toBeGreaterThanOrEqual(0)
+    expect(clickIndex).toBeGreaterThanOrEqual(0)
+    expect(saveCursorIndex).toBeLessThan(moveTraceIndex)
+    expect(restoreCursorIndex).toBeLessThan(moveTraceIndex)
+    expect(restoreCursorIndex).toBeLessThan(clickIndex)
+    expect(source).toContain('defer {')
+  })
+})