Hojun-Cho ff042df937 os/exec: subprocess supervision ...

Captured-async start/poll/cancel plus inherited-stdio run/runstdio with
process-group creation, close-on-exec errno marker for exec-setup
failure, TERM-grace-KILL escalation, and a signalfd interrupt watch.
test/wwfixture/process/main.ww is its self-exec harness, built by both
driver stages.

2026-08-07 23:00:58 +09:00

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