forked from 1b-agent/fieldcraft-upstream
Four triangles round a point (a square cut along both diagonals) share their free half-diagonals in pairs, so those alone cannot make every loop even when the square's perimeter is odd; the parity repair kept raising them until the step cap. A loop that keeps coming back now lets its coupled curves move. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo