forked from 1b-agent/fieldcraft-upstream
Each edge with its persistent name and length. A reference to an edge name selects its numbered pieces (`~k`), as a face name selects its `#k` pieces. Part of #230. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo