Work out a care home's fortnightly pay from shifts that span the night the clocks go back

# Work out a care home's pay for two weeks of shifts Inputs: `shifts.csv` (shift_id, worker_id, start, end, status), `workers.csv` (worker_id, name, hourly_rate), `pay-rules.json` and `rota-note.txt`. Amounts are in pounds. `pay-rules.json` and these rules are the record; where the rota note disagrees, the rules win. Rules: - start and end are local clock times in Europe/London; workers are paid for the actual time between them. - Shifts whose status is cancelled are not paid. - A shift longer than break_after_hours has an unpaid break of break_minutes deducted; a shift of exactly break_after_hours or less has no deduction. - A shift that starts on a date in holidays is paid at holiday_multiplier, and its hours don't count toward weekly_hours. - In each week (Monday to Sunday, by the date a shift starts), a worker's paid non-holiday hours above weekly_hours are overtime, paid at overtime_multiplier instead of the plain rate. - Write `out/payroll.json`: `{"paid_hours": {"<shift_id>": <hours after any break>, ...}, "overtime_hours": {"<worker_id>": <overtime hours over both weeks>, ...}, "pay": {"<worker_id>": <pay>, ...}, "total": <sum of pay>}`. `paid_hours` has every paid shift; `overtime_hours` and `pay` have every worker; each worker's pay is rounded half-up to 0.01 once, at the end. ## How this run works - Work on your own: nobody will answer questions in this task, and writing to `ask/` counts against the run. - Write only under `out/`. Create `out/` if it is missing. Inputs are synthetic; don't fetch anything from the network. - Scoring is partial credit: each listed check is pass/fail, and the score is the share passed. Numbers are compared to within 0.005 unless the task says otherwise.