b531023622
The per-step leases inside maybe_auto_archive / maybe_auto_prune_and_vacuum
(archive, prune, sweep, vacuum) cover every long step of the construction-time
block, and each renews right before the step it protects, so the extra
report_startup_progress(900) at the top of GatewayRunner._init_session_db
added nothing but a stale phase label ("gateway_startup_state_maintenance"
would outlive the archive step and mask the phase name in the fired record).
Dropped; gateway/run.py is back to origin/main.
Tests: the two contributor tests monkeypatched report_startup_progress in the
module and asserted phase names (change-detectors on the strings). Replaced by
one test that arms a REAL StartupWatchdogHandle and asserts the maintenance
block renews it four times with lease_until in the future — the property the
poller's `lease_until > now` branch actually needs (#111092). Red on
origin/main: lease_count stays at the schema-init lease.
Docs: HERMES_STARTUP_WATCHDOG / HERMES_STARTUP_WATCHDOG_TIMEOUT_S existed only
in the module docstring; add them to website/docs/reference/environment-variables.md
next to the respawn-storm variables (existing env vars only, no new surface).