The headless bench stubbed _send_sbx_input to a no-op, so run_shell
commands were staged to /tmp/.hh_*.cmd but the typed wrapper never ran —
the rc/out poll timed out and any shell-dependent task FAILed (mkdir+list
burned ~248s then failed). Make the stub run typed input in the bench
process (CWD == workdir), faithfully standing in for the room PTY, so
_run_shell_in_pty (staging/poll/cleanup) is exercised end-to-end.
Result: 3/3 pass. Surfaced a separate model-side argument leak in
script+run (tool JSON-schema dict passed as the command) — fixed next.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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