Previously, systemd_restart() sent SIGUSR1 to the gateway, printed
'restart requested', and returned immediately. The gateway still
needed to drain active agents, exit with code 75, wait for systemd's
RestartSec=30, and start the new process. The user saw 'success' but
the gateway was actually down for 30-60 seconds.
Now the SIGUSR1 path blocks with progress feedback:
Phase 1 — wait for old process to die:
⏳ User service draining active work...
Polls os.kill(pid, 0) until ProcessLookupError (up to 90s)
Phase 2 — wait for new process to become active:
⏳ Waiting for hermes-gateway to restart...
Polls systemctl is-active + verifies new PID (up to 60s)
Success:
✓ User service restarted (PID 12345)
Timeout:
⚠ User service did not become active within 60s.
Check status: hermes gateway status
Check logs: journalctl --user -u hermes-gateway --since '2 min ago'
The reload-or-restart fallback path (line 1189) already blocks because
systemctl reload-or-restart is synchronous.
Test plan:
- Updated test to verify wait-for-restart behavior
- All 118 gateway CLI tests pass
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