{"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-willowgablebungalow-ng6o6i2e","versions":[{"created_at":"2026-06-23T13:05:23Z","element_count":89,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"703baddc4acf673b93d64ad68ffd36293e05b67ef727fa93e6d01a397e6a9cdd","version":3},{"created_at":"2026-06-23T12:54:34Z","element_count":119,"note":"loop3: 設計時延床 48.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5432c6eb0a0da691254d53e7231738cd92e5bd11ead64e24823d54810df158f6","version":2},{"created_at":"2026-06-23T12:54:32Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}