{"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-house-w8rbpau7","versions":[{"created_at":"2026-06-11T01:05:17Z","element_count":83,"note":"5軸GA polish 41->96 by M5 (autonomous)","saved_by":"mcp","sha256":"99cd6c6fff082ecd59cd5381af62bcf56f08cedd5e018f9387e421f80ad58863","version":12},{"created_at":"2026-06-10T22:36:09Z","element_count":54,"note":"loop3: 設計時延床 40.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"33ca6cd18cdb5714155ec901c052068c5182d3396f1efb323dd0cc7a95f20672","version":2}]}