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fix(e2e): force-exit electron between sessions in optimizer cleanup test

On Linux CI, `ElectronApplication.close()` hung for the full 180s test
timeout after the first session seeded a running workload via the thv
API - the before-quit / graceful-shutdown path waits on a workload that
never drains. Add a `close()` helper on `LaunchedApp` that force-exits
via `app.exit(0)`, races `app.close()` against a 5s fallback, and
SIGKILLs the leftover process. Use it from both session teardowns in
the optimizer cleanup spec.

Made-with: Cursor