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* fix(scheduler): keep a one-time task's scheduled run after an early trial "Run once now" on a once task before its run time launched the trial as the task's own run: the launch marked the task running and finalize_occurrence then mapped the trial's outcome to completed, failed or cancelled. claim_due_tasks only claims enabled tasks, so the run never fired at run_at although next_run_at still showed it. A manual trial launched while next_run_at is still ahead now leaves the parent status and next_run_at unchanged, like a trial on a recurring task, at launch, in finalize_occurrence and in the launch repair (_associate_task_with_run). A trial after the run time has passed is still the task's run. * docs(changelog): reference #6512 * refactor(scheduler): scope the once-trial rule to once tasks and link its launch twin * fix(scheduler): keep a newer due-task claim through late launch bookkeeping With early trials leaving a once task enabled, the poller can claim the now-due task after the trial finished but before the trial's launch bookkeeping commits. That late update_after_launch passed can_project (the claim had not allocated an occurrence yet), kept the claim's "running" status under protect_terminal, and cleared the claim's lease, so the poller's admission was rejected as stale and the task was left running with no lease and no occurrence: unclaimable, and finalized from the trial by stuck-once recovery. A launch write identified by its occurrence never owns the parent lease (scheduled admission releases the claim with the queue insert, and a manual trial takes none), so update_after_launch now clears the lease only for a write with no occurrence row, which is the claimer's own pre-admission failure. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>