{"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-zty9gb08","versions":[{"created_at":"2026-07-03T06:03:15Z","element_count":73,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"56cfe2a9015b47909c994de8d455542b1a64f2e0c6752a987d579c213c6a8dc0","version":3},{"created_at":"2026-07-03T05:57:25Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d119e66e3699942a39676eea0093d0b03093d1bd612b75cb398fbe9d63691e55","version":2},{"created_at":"2026-07-03T05:57:25Z","element_count":105,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}