{"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-0xdbc8ei","versions":[{"created_at":"2026-06-10T13:25:33Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積106.2㎡(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":"40398cdb87f6896d038a50810c5040b632d910a2fb4c0dafa3e678847587c656","version":11},{"created_at":"2026-06-10T11:09:49Z","element_count":83,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e24a08fb6829e435f430d11596ad764dc138e801a4eefd211189a9e5843d24d5","version":4}]}