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* fix(scheduler): pause a task whose schedule no longer computes Admission validates every schedule, but a stored one can stop computing later: a zone the installed tz database no longer has, or a cron expression a newer croniter rejects. The scheduler recomputes next_run_at inside the shared poll, and that raise escaped: - dispatch_task recomputed it in its except block after a successful launch, so run_once aborted the claimed batch and left the occurrence in "launching" with no last_error; - once the launch lease expired, recover_expired_launch_claims found the durable run and raised again for every poll, before claim_due_tasks, so no other scheduled task was admitted for the rest of the process. Runtime cursor writes (launch, launch repair, queue timeout, launch failure, finalization) now use stored_next_run_at, which returns the reason instead of raising. A live recurring task is paused with "schedule can no longer be computed: ..." as its last_error and no next run; a once task keeps its normal outcome. Resume re-validates the schedule, so it reports the problem until the schedule is fixed. run_once also isolates the lease-recovery pass, like the terminal-run reconciliation next to it, so a failed pass no longer skips admission. * docs(changelog): reference #7993 for the unschedulable task fix