The cutover of 2026-10-20: adopted at event 466, every number unchanged, backups to two places, the old copies put aside. P3 next. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj