test(260610-hbu-02): update reminderScheduler tests for catch-up + per-uid dedup
- Add SINGLE-FIRE: 3 consecutive ticks, exactly 1 dispatch total
- Add MISSED-TICK-RECOVERY: fires at 8-min lead when ideal 15-min tick skipped
- Add ALREADY-STARTED: dtstart<=now returns no rows, 0 dispatches
- Add CR-01 pruning: started-event entry pruned after dtstart passes
- Add D-16: empty subscriptions, zero sends, no crash
- Add T-05-19: per-sub error isolation, both subs attempted when first throws
- Add fan-out: 2 subs -> 2 dispatches for one event
- Rewrite WR-01 test to per-uid dedup language; remove minuteBucket tests
- Update file docblock for catch-up (now, now+16min] window and per-uid dedup
Lucas Berger
93bb2c1c68