The dispatch path abandoned a handoff after a fixed 5s while the dead-owner
recovery ledger already tolerates HANDOFF_ADOPTION_GRACE_SECONDS (30s) for the
same pending handoff. Field measurements (issue #109243: p90 claimed->started
10.7s, cold worker starts 9-12s dominated by imports plus secret hydration)
put the cold mode squarely inside the old deadline, so healthy handoffs were
logged as ownership-uncertain and never had their worker pid recorded. Use the
one constant the ledger already defines instead of a second, separately tuned
number, so the two guards around one event cannot disagree again.
Reshapes the salvaged test from #109252 to the current
restart_safe_gateway_child_argv signature and asserts the acknowledged-path
side effect (worker pid recorded) rather than clock progress.
Fixes#109243
teknium1
157aa716b7