{"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-masonstreethouse-ofbyn380","versions":[{"created_at":"2026-07-02T19:55:05Z","element_count":91,"note":"5軸GA polish 46->97 by M5 (autonomous)","saved_by":"mcp","sha256":"b6ae79b3ee89dbaf5417d4f9001720c432e28384f77443057d4221899506e561","version":3},{"created_at":"2026-07-02T19:49:54Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"bf80342df2d5b1ed64d4060f1e141119fb66f24dddc11a45fffd55dd4b0c80ec","version":2},{"created_at":"2026-07-02T19:49:54Z","element_count":126,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}