{"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-ym5p62lu","versions":[{"created_at":"2026-06-11T00:31:43Z","element_count":84,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b583eff6994e883e290f0ab43807f9685970fa54cf8a94ae56b2e200af20b749","version":15},{"created_at":"2026-06-10T21:55:14Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"048eceffcaa3405a8c57fb8dd9c1ae54d531d8f3b19d53977ec2300c767d2f33","version":2}]}