A systemd-supervised gateway (INVOCATION_ID set) with no user D-Bus
session (containers, minimal LXCs, supervisors without linger) fails
EVERY scheduled job at dispatch: restart_safe_gateway_child_argv()
raises, run_one_job() records a failure, and the only symptom is
silently skipped executions (a missed nightly backup, dead watchdogs,
no alert).
Cron now degrades to a direct external subprocess with a
once-per-process warning instead of raising, unless
cron.require_restart_safe_scope=true (config.yaml, default false)
restores fail-closed. Degraded jobs keep process separation and the
full #101940 ownership handoff - only cgroup isolation is lost, so a
mid-job gateway restart kills the worker and the execution ledger
records exactly that.
The dispatch is a GatewayChildDispatch NamedTuple (in_process /
scoped / degraded) so the degraded case can never collapse into the
"not managed, stay in-process" sentinel - the failure mode that would
recreate the restart-interruption edge #101940 closed.
Kanban stays fail-closed (require_restart_safe_scope=True at its call
sites): its workers are long-lived agentic runs, so the degrade policy
is limited to bounded cron jobs in this PR.
Addresses the #102431 review: the env-var flag became a config key per
AGENTS.md (no new HERMES_* non-secret vars), Kanban keeps fail-closed
instead of updating its tests to a degraded contract, main's
enable-linger remedy message is preserved, and the degrade warning
fires once per process.
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