Fix/windows job object protection

[ilyaxuwu]

Job Object protection has been added to prevent child processes spawned in Windows from remaining active when the parent crashes.

isolated-command.ts — Using Bun.FFI, CreateJobObjectW, AssignProcessToJobObject, and SetInformationJobObject are called via kernel32.dll. Thanks to the JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE flag, Windows automatically cleans up the child process when the parent dies. If FFI cannot be found, it silently falls back.
run-terminal-command.ts — After spawning, protectChildWithJob(pid) is called, and cleanup is triggered on the process close event.