{"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-h57jkh5n","versions":[{"created_at":"2026-06-11T00:48:47Z","element_count":73,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"c1607c92f868f597b59ac4bd976901194fea0ec62eb9a1f0e239f04604b7e3b7","version":15},{"created_at":"2026-06-10T21:56:37Z","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":"8891412bdda114dcbf96ccab6fbfc9cd7816b039474b3aecc6aaa93d8e7093b1","version":2}]}