On ROCKNIX's read-only squashfs root, network services don't need
graceful shutdown — only persistent storage sync matters. Services
like iwd and systemd-resolved can hang for 90s (the systemd default)
on shutdown/reboot, blocking device access during development and
causing poor user experience on handheld gaming devices.
Changes:
- Add system.conf.d/10-shutdown-timeout.conf with
DefaultTimeoutStopSec=5s and DefaultTimeoutAbortSec=5s
- Add TimeoutStopSec=1s to iwd.service (matches existing pattern
used by avahi, bluez, sshd, samba)
- Add TimeoutStopSec=1s to systemd-resolved override
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>