## Summary
- Adds `LimitNOFILE=65536` to both web and worker systemd service units
- Fixes recurring `Errno::EMFILE` (Too many open files) errors during
peak traffic after deploys
## Context
Puma workers idle at 720-770 open FDs against the default soft limit of
1024, leaving ~250 FDs of headroom. During deploy-triggered instance
refreshes at peak traffic, concurrent requests exhaust the remaining
FDs, causing EMFILE across all web instances.
3 incidents in March 2026 with escalating event counts. The hard limit
is already 524288, so this just raises the soft limit to a standard
production value.
Self-hosted instances pick this up automatically via `cwctl --upgrade`.
Fixes
https://linear.app/chatwoot/issue/CW-6685/errnoemfile-too-many-open-files-rb-sysopen
775b73d1f9