Test Mac app control

Run from the repository root. Select the cheapest checks that cover the change:

swift test --package-path apps/desktop/native/computer-use --filter ComputerUseCoreTests
pnpm exec vitest run apps/host/src/computer-use/computer-repl/computer-repl.test.ts
pnpm exec vitest run packages/protocol/src/computer-use-helper-wire.test.ts tests/computer-use-action-schema.test.ts
pnpm --filter @opensteer/web test:computer-windows

Keep core tests entirely fake; never drive host windows, focus or input. For real AppKit/Electron owner input and decoded H.264, run the existing journey in the VM:

pnpm test:vm -- bash native/computer-use/Tests/Fixtures/MacOwnerInputJourney/run-vm.sh