{"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-z2xrl6fb","versions":[{"created_at":"2026-06-11T01:56:56Z","element_count":89,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1c3b030a297f2719c2c9be110750df29e370f1fe4e97845a28ad8d3c2647541c","version":5},{"created_at":"2026-06-11T00:35:34Z","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":"914bf6c81951d5a4ec7adf7ae9fb5a667bda61107d5fe966859d48d3f54e1c89","version":2}]}