Salvages the primary fix from #24275 (asdlem) and layers a last-resort
fallback on top:
Primary (from #24275): the real macOS 26 root cause is that `gui/<uid>`
isn't reachable from non-Aqua/background sessions. Switch the launchd
domain to `user/<uid>` and mark the plist valid for both Aqua and
Background sessions (LimitLoadToSessionType), restoring a real supervised
service. Treat exit code 125 as "job unloaded" so start/restart
re-bootstrap and retry.
Last resort (this PR): the #23387 reporter saw `user/<uid>` bootstrap
also fail with error 5 on some hosts. When even a fresh bootstrap can't
manage the domain (codes 5/125 persist), degrade to a CLI-managed
detached background process instead of crashing — logs to gateway.log,
PID tracked via gateway.pid so stop/status/restart keep working. Print
guidance that it won't auto-start at login or auto-restart on crash.
Co-authored-by: asdlem <asdlem@users.noreply.github.com>
Brooklyn Nicholson
3606307339