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fix(batch): drift-free scheduler via schedule:work so dailyAt minutes don't get skipped (#796)

The laravel-scheduler supervisor program ran `while true; do schedule:run;
sleep 60; done`. Each iteration is ~61s (schedule:run dispatch time + a flat
60s sleep), so the loop drifted ~1s/minute. Roughly once an hour the loop
straddled a clock-minute boundary and skipped that whole minute of
schedule:run, so any job pinned to an exact ->dailyAt('HH:MM') could silently
never fire.

On 2026-06-18 the dropped minute was 02:30 — the only minute hosting
stats:generate-daily — so the daily per-group `stats` rows for 2026-06-17 were
never generated and monitor:scheduled-outcomes alerted (ScheduledOutcomes
error 7559501667).

schedule:work runs schedule:run aligned to the top of each clock minute and
never drifts, eliminating the class of bug for every dailyAt job.

Co-authored-by: root <root@localhost>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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