Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Refactor a legacy freight tariff into structured output while preserving its quirks for old orders

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  "result": "`solve.py` is written at `work/solve.py`. It uses only the standard library and runs `python solve.py input.json answer.json`. On the given orders it writes `answer.json` in about a second, well under the 30-second limit. I did not run the hidden checks, so the fresh-run checks are untested.\n\n**Verification:** For the 55 orders dated before 2027, the `total` strings match the legacy script's output exactly (0 mismatches). The intermediate values come from the same formulas in the same order of operations, so they should match too, but only the totals were compared against the legacy run. The 2027+ rules were spot-checked by hand on a few orders.\n\n**Legacy quirks kept as-is** (since old invoices depend on them):\n- Zone `Z` with more than 30 billable kg is billed at rate B, not treated as an error.\n- Only the last `D` flag sets the discount. Discounts don't stack.\n- Flags are case-sensitive, so `x` doesn't trigger the express doubling.\n- Insurance has a 0.50 floor for declared values over 100.\n- Remote and discount use the legacy order of operations.\n\n**2027+ rules:** the zone rate applies with no weight switch, and zone `Z` is an error. Hazmat `H` adds 15.00 after remote, and it is not discounted. Before 2027, `H` is ignored.\n\n**Choices I made where the spec was open:**\n- Numeric fields that are zero are output as `0.0`, not `0`. Numerically they are equal.\n- Zone is uppercased but not stripped, so `\" B\"` is an error, as it is in the legacy script.\n- Dates are parsed as ISO `YYYY-MM-DD`.",
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