v0.38.4

Patch Changes

• fix: tear down the ok ui sibling when ok start exits via a signal

  ok start spawns a detached ok ui process to serve the editor shell. On Ctrl+C (SIGINT/SIGTERM) the CLI destroyed the collab server but left that UI child running until its 12-hour safety timer expired, holding its port so the next ok start bound a different one. The signal path now runs the same guarded UI teardown as idle-shutdown — SIGTERM, wait out a grace window, then escalate to SIGKILL — scoped by spawnedUiPid to the sibling this process actually spawned, so a lock holder we did not spawn (a desktop shell, another session) is left alone.