docs/plan.md covers exporting BeatLeader and ScoreSaber history into a
raw archive, a SQLite fork of beatleader-server, merging ScoreSaber
scores into BeatLeader scores, ArcViewer replays, and a daily sync.
AGENTS.md points new sessions at it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
