{"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-maplewoodbungalow-45z8p8nz","versions":[{"created_at":"2026-06-13T18:34:28Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"3780fe006b30c6d4eaef74b6464f077e1da97bfc100d74b03b5f71cd371741b1","version":3},{"created_at":"2026-06-13T18:23:03Z","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":"d605eb359ce3e5da76b0c9584616164a3a7f29598fe1d6409273e0b939fa6c5a","version":2},{"created_at":"2026-06-13T18:23:03Z","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}]}