{"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-willowbrookbungalow-e1huri8z","versions":[{"created_at":"2026-06-13T17:52:21Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b96e9968df6c6837e4152a036a3b129d01e806b95556e079fb81945e7ba9a620","version":3},{"created_at":"2026-06-13T17:37:30Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"13cdb2a7cd8460b2399a143f1492dd0571745c5cd88c00af937a432b7b178708","version":2},{"created_at":"2026-06-13T17:37:30Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}