sgerrand / git_hoox / 26526651560

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fix(cmd): redirect child stdin to /dev/null

Child processes spawned via Port.open with :use_stdio inherited
the BEAM process's stdin. Tools that read fd 0 on startup (e.g.
mado, anything calling blocking read without isatty checks) hung
forever inside hooks until the runner timeout fired.

Spawn through `sh -c 'exec "$0" "$@" </dev/null' exe args...` so
the child sees EOF immediately. exec keeps the target as the direct
port child, so no extra sh lingers and BEAM still receives
:exit_status from the real process.

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