{"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-gpjii2vc","versions":[{"created_at":"2026-06-11T01:05:16Z","element_count":73,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f3dafb3fe61b2ecfdb22d61c3116a51f5e0df9d4881eea6903f5e58ab5ca96db","version":14},{"created_at":"2026-06-10T22:15:19Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"9ee245412c8280ba93bbc840b15eecbc9836ccfc2cbd51b58bfabbed222463b1","version":2}]}