Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Turn weekly ad-platform exports into an exact wasted-spend report

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  "result": "`solve.py` is written in `./usecase-runner/runs/n05-claude-haiku/work/`. It runs cleanly with `python3 -I solve.py input.json answer.json` and writes `answer.json` plus `chart.svg`. I can't see the hidden scoring checks, so correctness rests on reading the spec and hand-checking the output.\n\n**Results on the given exports**\n- Totals: spend $3,636.06, wasted $2,178.61 (59.9%). Google spend $1,301.91 / wasted $603.93; Meta spend $2,334.15 / wasted $1,574.68.\n- `rows_dropped`: `duplicates` 5 (3 Google, 2 Meta), `out_of_range` 25, `non_data` 2 (the `Total:` rows).\n- Top 5 wasted units: meta Competitor/35-54, meta Brand/Broad, meta Competitor/Remarketing 30d, meta Competitor/Broad, meta Video/Top Funnel.\n- A small synthetic export with a BOM, EUR Meta spend, a quoted `\"1,000.50\"` cost, and an out-of-range row gave the expected EUR\u2192USD conversions and drop counts.\n- `chart.svg` parses as XML and has `wasted-bars` and `bar-1`..`bar-5`.\n\n**Choices I made where the spec was open**\n- **Meta value and conversions:** a row only contributes conversions and `conv_value` when its `Result indicator` is the purchase indicator. Otherwise both are 0, so a non-purchase row's value is dropped even if the file has one.\n- **Display names:** the first-seen form comes from rows that survive dedupe and the date filter, not from every line in the file.\n- **Bad numeric cells:** anything unparseable other than blank or `--` is treated as 0 rather than crashing the run.\n- **Duplicates:** matched on the exact raw line, per file.\n- **Chart:** `chart.svg` is written next to `answer.json`, and it includes the standard SVG `xmlns` URL. If the checker treats any `http` string as an external URL, that is the line to change.\n- **Rounding:** all arithmetic is in `Decimal` (no float error); money is rounded half-up only at reporting.\n\nI did not run the scoring checks, and I did not test against generated fresh exports beyond the one synthetic case.",
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