Rate a courier firm's shipments with dimensional weight, zone bands, a minimum charge, a weekly fuel surcharge and residential fees

# Rate a courier firm's shipments with dimensional weight, zone bands, a minimum charge, a weekly fuel surcharge and residential fees Inputs: `shipments.csv` (awb, account, from_zone, to_zone, service, weight_kg, length_cm, width_cm, height_cm, residential, ship_date), `zones.json` (band for each zone pair, listed once in either order), `rates.json` (per service and band: base, per_half_kg) and `surcharges.json` (dim_divisor, min_charge, residential_fee, fuel: list of {week_start, pct}). All accounts and parcels are synthetic; amounts are in dollars. These rules are the firm's policy; where `ops-note.txt` disagrees, the rules win. Rules: - Billable weight: dimensional weight = length_cm × width_cm × height_cm / dim_divisor. Billable weight is the larger of weight_kg and dimensional weight, rounded up to the next 0.5 kg. - Transport: look up the band for the zone pair (A-B is the same pair as B-A). Transport = base + per_half_kg × the number of half kilos of billable weight above 1 kg, and never less than min_charge. - Fuel: use the pct of the fuel row whose week_start (a Monday) begins the week containing ship_date. Fuel = pct percent of transport, rounded half-up to the cent. The residential fee is not fuel-surcharged. - Residential: add residential_fee when residential is yes. Shipment total = transport + fuel + residential fee. - Write `out/rated.json`: `{"shipments": {"<awb>": {"billable_kg": <number>, "transport": <dollars>, "fuel": <dollars>, "residential": <dollars>, "total": <dollars>}, ...}, "accounts": {"<account>": <sum of totals>, ...}}`. ## 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.