{"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-2abz2xm8","versions":[{"created_at":"2026-06-20T19:55:49Z","element_count":82,"note":"5軸GA polish 38->93 by M5 (autonomous)","saved_by":"mcp","sha256":"cf9f66ed6497dcf9c1b0bb7c5285ed642a639352e541af0d933b129d93de1942","version":3},{"created_at":"2026-06-20T19:40:21Z","element_count":119,"note":"loop3: 設計時延床 60.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d24081ffbd6aff94392da5e31a561512b206f51b650a4b9f371e17548609098e","version":2},{"created_at":"2026-06-20T19:40:20Z","element_count":119,"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}]}