{"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-house-cq8rh88x","versions":[{"created_at":"2026-06-10T13:16:10Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"d71770842355b5851f350249b9d2e28ba7d59d438d3872984c112b73a047ee89","version":10},{"created_at":"2026-06-10T09:38:02Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f704b1e77f5ccf033503d78cbf5e806a122b48d05dec7ba96bb733733ca3e638","version":2}]}