{"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-mercersedgebungalow-8llk5ckk","versions":[{"created_at":"2026-06-23T04:48:15Z","element_count":72,"note":"5軸GA polish 49->97 by M5 (autonomous)","saved_by":"mcp","sha256":"6cdfc4335a169d5e179ffb16ecf1065ba3d29dbc05ef334daf830634e34ad79b","version":3},{"created_at":"2026-06-23T04:40:21Z","element_count":109,"note":"loop3: 設計時延床 120.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"74e9666ffc8b1f4cbfdda4b454286d0a0cb9f5f8215601cb7bddecdfc01f425e","version":2},{"created_at":"2026-06-23T04:40:21Z","element_count":109,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+study+storage","saved_by":"mcp:create","sha256":"","version":1}]}