{"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-willowbrookhouse-4id308bi","versions":[{"created_at":"2026-06-13T18:05:50Z","element_count":85,"note":"5軸GA polish 49->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5e7bb897ca0eecfe51902d7c8cd75cd39a7fa8f487c87808e3dc5547fa8e6dfa","version":3},{"created_at":"2026-06-13T17:55:45Z","element_count":91,"note":"loop3: 設計時延床 120.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"faf6c207d54f8a2f6b11756236470e115402930f317c5fbcba64fab3d459c372","version":2},{"created_at":"2026-06-13T17:55:42Z","element_count":91,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}