_park_provider_unavailable parked the provider + offlined the instance but
never registered a WaitingRecord, so _on_probe_success -> _parked_agents_for
(always filtered on waiting_for=='rate_limit_lifted') returned [] and
resolve_wait revived nobody — recovery fell to the 600s stale-claim reaper
instead of the probe-success path the parking design relied on.
Register + persist a rate_limit_lifted WaitingRecord at park time (mirrors
mark_waiting_long, minus stop_agent — the container is already dead).
Companion reaper guard: _reap_with_service now skips provider-parked
assignees (_assignee_is_provider_parked) so the claim survives until the
probe revives the agent — otherwise the reaper releases the claim to pending
and probe-success respawns on a task the agent no longer owns.
Renn F
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