{"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-willowcreekhouse-4o3gedfo","versions":[{"created_at":"2026-06-13T18:34:26Z","element_count":83,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4e10e41b83acf2fa0e6e4bebeac01d97b2b8d5b0dfdeb94c029bc44dcb21b027","version":3},{"created_at":"2026-06-13T18:27:17Z","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":"f26e856c3665dcb7f051d42c5162bb39966e139a5b6c1d88256a288ae045197c","version":2},{"created_at":"2026-06-13T18:27:12Z","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}]}