Settle a property manager's security deposits on move-out with interest, final-month proration, allowed deductions and a statement deadline

# Settle a property manager's security deposits on move-out with interest, final-month proration, allowed deductions and a statement deadline Inputs: `tenancies.csv` (tenancy_id, unit, move_in, move_out, monthly_rent, deposit, final_month_paid, statement_sent), `charges.csv` (charge_id, tenancy_id, type, item, amount), `move-in-report.csv` (unit, item: conditions already recorded when the tenant moved in) and `deposit-rules.json` (interest_rate_pct, cleaning_cap, statement_days). All tenants and units are synthetic; amounts are in dollars. These rules are the record; where `leasing-note.txt` disagrees, the rules win. Rules: - Interest: deposit × interest_rate_pct / 100 × whole months held / 12, rounded half-up to the cent. Whole months held = the number of monthly anniversaries of move_in (same day number in a later month) that fall on or before move_out. - Final month: the rent owed for the move-out month is monthly_rent × (move_out's day number) / (number of days in that month), rounded half-up to the cent; final_rent_due = that amount − final_month_paid (negative means the tenant overpaid and is owed the difference). - Deductions: a charge of type wear is never deducted. A damage charge is deducted only if its item is not listed for the same unit in move-in-report.csv. Cleaning charges are deducted up to cleaning_cap in total per tenancy. unpaid_rent charges are always deducted. - Late statement: if statement_sent is more than statement_days days after move_out, nothing from charges.csv may be deducted for that tenancy (deductions = 0); final_rent_due still applies. - Balance: refund = deposit + interest − deductions − final_rent_due. If that is negative, report refund 0 and balance_due = the shortfall; otherwise balance_due is 0. - Write `out/deposits.json`: `{"tenancies": {"<tenancy_id>": {"interest": <dollars>, "final_rent_due": <dollars>, "deductions": <dollars>, "refund": <dollars>, "balance_due": <dollars>}, ...}, "total_refunded": <sum of refund>}`. ## 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.