Invoice a landscaping firm's jobs from mowing areas, hedge height bands, mulch bags, contract discounts and tax on materials

# Invoice a landscaping firm's jobs from mowing areas, hedge height bands, mulch bags, contract discounts and tax on materials Inputs: `job-lines.csv` (line_id, job_id, client_id, service, area_m2, length_m, height_m, depth_cm; fields that don't apply to a service are blank), `clients.csv` (client_id, contract) and `rates.json`. All clients and jobs are synthetic; amounts are in dollars. These rules are the firm's price list; where `crew-note.txt` disagrees, the rules win. Rules: - Mowing: area_m2 × mow per_m2, rounded half-up to the cent, but never less than the mow min_charge for the line; a client with contract yes then gets contract_pct percent off each of its mowing lines (the discount rounded half-up to the cent). - Hedges: length_m × the per_m rate of the first hedge band whose max_height_m is at least the hedge's height_m (a height exactly on a band limit takes that band; the last band has no limit), rounded half-up to the cent. No contract discount. - Mulch: volume = area_m2 × depth_cm / 100 cubic metres; bags = volume / bag_m3 rounded up to a whole bag; the line is bags × bag_price (materials) + bags × spread_per_bag (labour). No contract discount. - Tax: each job pays tax_pct percent of its mulch materials only (bags × bag_price summed over the job), rounded half-up to the cent once per job; labour and services are not taxed. - Write `out/invoices.json`: `{"lines": {"<line_id>": <line amount after any discount>, ...}, "jobs": {"<job_id>": {"services": <sum of its line amounts>, "tax": <dollars>, "total": <services + tax>}, ...}, "clients": {"<client_id>": <sum of its job 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.