flyd mounts the local Machines API (flaps) socket at /.fly/api owned
root:root 0755, but the gateway runs as the unprivileged hermes user.
The scale-to-zero self-suspend (gateway/scale_to_zero.py suspend_self)
therefore failed every attempt with EACCES and an opted-in machine could
never sleep — fail-awake held, but the feature was inert. Verified live
on staging 2026-08-20: repeated 'flaps suspend request failed: [Errno
13] Permission denied' until a manual chgrp/chmod on the socket, after
which the same watcher tick suspended the machine cleanly (flaps 200 ->
suspension/suspended).
stage2 runs as root before the supervision tree starts: chgrp hermes +
g+w on the socket when present. Minimal widening — the socket stays
root-owned; no-op off Fly.
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