{"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-vbucr223","versions":[{"created_at":"2026-06-11T04:11:19Z","element_count":83,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"fad7560170fffa5b0bb3ddb2fcd0716913e46efd9ca5e7e5cbade1cfaf3b0ffe","version":3},{"created_at":"2026-06-11T03:57:21Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f0aeb73a3768484b0b4d2c10fc8c00873539644692a1b27aea509c3ff609b550","version":2}]}