Replace the Windows tasklist shell-out in isProcessAlive with
process.kill(pid, 0), unifying all platforms on the POSIX idiom. Node maps
signal-0 to an OpenProcess existence check on Windows — and the Windows
daemon runs under Node (dist/server-node.mjs + bun-polyfill, the documented
oven-sh/bun#4253 fallback) — so the probe is portable.
Why the shell-out had to go, beyond the cosmetic conhost flash the watchdog
blinked into the foreground every 60s (#1952): a Bun.spawnSync that hits
its timeout still RETURNS with partial stdout, so the `.includes()` PID
match answered "dead" for LIVE processes under load — the false-negative
half of the #2414/#2295 leak chain. Signal 0 spawns nothing, cannot time
out, and is ~5 orders of magnitude faster (measurements in #2414). EPERM
still reports alive (process exists, we just can't signal it).
Layered on the post-#2414-absorb shape: test 3 in
process-liveness-windows.test.ts now asserts the probe is subprocess-free
on ANY platform (win32 exemption dropped), test 4's static tripwire loses
its error-handling.ts exemption (a `tasklist … PID eq` existence probe
anywhere in src/ now fails CI), and windows-spawn-hide.test.ts drops its
tasklist-in-error-handling needle (nothing spawns, which is stronger than
hiding the window).
Tests: process-liveness-windows + windows-spawn-hide + error-handling —
17 pass, 0 fail.
Fixes#1952.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
