{"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-tramwayshouse-el2zj18x","versions":[{"created_at":"2026-06-24T19:06:36Z","element_count":82,"note":"5軸GA polish 40->93 by M5 (autonomous)","saved_by":"mcp","sha256":"7a6949c2b267bfa70eaf5aac9afea44060b07eb791fdd39ed9cb6a46fa834b20","version":3},{"created_at":"2026-06-24T18:55:58Z","element_count":86,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"88f8dbf4d013debf2cd7a6cf9f74d638e9f59a797d1dea828353c7cc20d06152","version":2},{"created_at":"2026-06-24T18:55:58Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}