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`codegraph ui` re-execs itself with `--liftoff-only`; the shim the user started blocks in spawnSync and cannot forward a signal. Killing it by pid — a process manager, an IDE task, `kill` — left the re-exec'd server serving its port forever (found during a sweep: servers from hours earlier were still answering on ports 4801–4808 against deleted indexes, holding their stdout pipes so the harness that started them never exited). Ctrl+C was unaffected (the signal reaches the whole process group). `index`/`init` already guard this with the #277 PPID watchdog. Factor it out of installCommandSupervision as `watchParent(onLost)` and use it in `ui` with the same shutdown as SIGINT/SIGTERM (close the index, then the socket). The liveness watchdog is deliberately not installed for `ui`: a long Steps computation can legitimately hold the event loop. Test: POSIX end-to-end through the real relaunch (CODEGRAPH_WASM_RELAUNCHED unset, 200ms poll) — SIGKILL the shim, the port stops answering; confirmed failing without the fix. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>