- compute-days.test.ts: 8 tests covering single day, two days, three days,
ascent/descent, edge cases (first/last overnight, single waypoint, empty)
- generate.test.ts: 4 new tests for isDayBreak emission, GPX roundtrip with
isDayBreak preserved, and splitByDay multi-track output
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>