{"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-fwec3f70","versions":[{"created_at":"2026-06-20T06:12:33Z","element_count":71,"note":"5軸GA polish 43->94 by M5 (autonomous)","saved_by":"mcp","sha256":"e738eb1d40a055959b7ce77fd1a6845574e1963ff7c01649062bb4ae77988c27","version":3},{"created_at":"2026-06-20T06:06:56Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f44f86feb19fa52fdb135dcd9a7e5bba81c43e11868732b1b3fbf44cb8ef7c10","version":2},{"created_at":"2026-06-20T06:06:54Z","element_count":88,"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}]}