## Summary
- stop the macOS helper from unlinking caller-supplied socket and token paths
- keep parent-owned token cleanup tied to the helper startup that created it
- fail closed for non-socket socket-path collisions and cover helper cleanup races with regression tests
## Verification
- swift test --package-path native/computer-use-macos
- pnpm exec vitest run --config config/vitest.config.ts src/main/computer/macos-native-provider-client.test.ts
- pnpm run typecheck:node
- pnpm lint
- pnpm run build:computer-macos
- Electron/helper startup smoke validation
Trevin Chow