{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-tomioka-rowhouse-djdk7eqe","versions":[{"created_at":"2026-09-21T08:25:19Z","element_count":94,"note":"言葉から生成: tomioka-rowhouse","saved_by":"mcp:create","sha256":"","version":1}]}