Generate an agent-to-agent handover document (経路B) or next-session handoff from the current session state: repo, worktree, branch, open PRs/issues, scope, constraints, and the mandatory rule block. Invoke with: /handover [宛先: codex|cursor|opencode|次セッション]. Use when the user says 'ハンドオーバー作って', '引き継ぎ文書', '次のセッションへの引き継ぎ', 'Codexに渡す資料', 'handoff', or when context is running low and work must continue elsewhere. Do NOT use for: progress reports (use /wave-report), PR descriptions, or delegating a small single task (write the task prompt directly).
