Work out a week's hourly pay with daily overtime, double time over 12 hours, split shifts and a weekly 40-hour rule

# Work out a week's hourly pay with daily and weekly overtime Inputs: `staff.csv` (employee id, hourly rate) and `timesheet.csv` (every shift clocked in the week Monday 2026-10-12 to Sunday 2026-10-18: start, end and unpaid break in minutes). Times are on the quarter hour and no shift crosses midnight. Pay rules: - A shift's hours = end - start - unpaid break. - If someone works two shifts in one day, add them together before applying the daily rule. - Daily overtime: hours over 8 in a day are paid at 1.5x, and hours over 12 in a day at 2x. - Weekly overtime: hours that are not daily overtime count as regular until the week's regular hours reach 40; regular hours beyond 40 (counting days in date order) are paid at 1.5x instead. - Gross pay = hourly rate x (regular + 1.5 x overtime + 2 x double time), rounded to the cent half-up per employee. Write `out/payroll.json`: `{"regular_hours": {"<employee_id>": <hours>, ...}, "overtime_hours": {...}, "double_hours": {...}, "gross": {"<employee_id>": <gross pay>, ...}, "total_gross": <sum of the rounded gross figures>}` with every employee in `staff.csv` (an employee with no shifts has 0 everywhere). ## 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.