Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Great-circle vs rhumb-line passage plan with ETAs

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  "result": "`solve.py` is written and runs under the 60-second limit with the standard library only. It produces `answer.json` and `route.svg` in the work directory for the provided input. Arrival is `2026-12-01T04:11Z`, and the rhumb route is 0.028% longer than the great circle.\n\n**Results for `input.json`:** total great circle 2105.17 nm, total rhumb 2105.77 nm.\n\n**Checks I ran:**\n- Great-circle distances match an independent spherical law-of-cosines calculation to four decimals.\n- No ETA falls near a half-minute tie, so the rounding rule can't flip a result.\n- Edge-case input (east-west leg, zero-length leg, antimeridian crossings) runs cleanly. The SVG parses as well-formed XML and contains no script, image, or link elements.\n\n**Choices I made where the spec was open:**\n- **ETA uses unrounded cumulative distance.** I divide the unrounded rhumb distance by speed, then round the elapsed time to the nearest minute. The spec doesn't say whether to round the distance first. None of the current legs are close enough for this to matter.\n- **Totals and the percentage use unrounded sums.** Rounding happens only on output.\n- **`route.svg` goes next to `answer.json`.** When run as `python solve.py input.json answer.json` from the work directory, that is the same directory.\n- **Course normalisation.** Courses are mapped into [0, 360), and values that round up to 360 are set to 0.\n- **Drawing.** The SVG uses a Mercator projection with unwrapped longitudes, so the route stays continuous across the 180\u00b0 meridian. The spec doesn't grade the drawing.\n\nFiles are in `./usecase-runner/runs/k09-claude-haiku/work/`: `solve.py`, `answer.json`, `route.svg`. The work directory isn't a git repo, so I did not commit anything.",
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