{"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-0psmzey4","versions":[{"created_at":"2026-07-19T17:39:16Z","element_count":70,"note":"5軸GA polish 44->96 by M5 (autonomous)","saved_by":"mcp","sha256":"cf4e06c218c5e393fb75a7ed189067a2962728330b049c899e30b3ec5f6c88fb","version":3},{"created_at":"2026-07-19T17:31:15Z","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":"32cca31582f33f75acc8ea20240b4d7d66e928110057106630418941c45472cd","version":2},{"created_at":"2026-07-19T17:31:15Z","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}]}